{"title":"Antlia Narrowband Filters","description":"\u003cp\u003eEvery Antlia narrowband filter we carry: the ultra-narrow 3nm Pro and 4.5nm EDGE H-alpha, OIII and SII lines in 1.25\", 2\" and 36mm. Part of \u003ca href=\"\/collections\/narrowband-filters\"\u003eNarrowband Filters\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"antlia-3nm-narrowband-oxygen-iii-oiii-pro-filter-1-25-mounted","title":"Antlia 3nm Narrowband Oxygen III (OIII) Pro Filter - 1.25'' Mounted","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eAntlia OIII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cins cite=\"mailto:Ted%20Dobosz\" datetime=\"2021-01-06T13:06\" style=\"text-size-adjust: 100%;\"\u003e\u003c\/ins\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ebandpass\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eOIII\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eare\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e designed to deliver \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e85\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e% transmission at the 500.7nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eshift\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e We guarantee T\u0026gt;\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e85\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e% within 1nm range of the center bandwidth, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eB\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003elue\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eloss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e5\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e (0.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e00\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSNR(\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003esignal to noise ratio\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e)\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e and effective cut\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eoff rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eImproved sharp cut\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eoff astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eApplication and Performance:\u003c\/span\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e to maximize\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003econtrast\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eNarrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eExtend\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eimaging time when the moon is up\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003edown \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eto F\/3\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e systems\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003ewith slight loss of signal\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eAll A\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003entlia\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eThis filter is not suited to deep sky objects that do not contain OIII emissions.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e\u003cspan style=\"font-size: 14px;\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSolar Observing and imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eVisual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eDO NOT LOOK AT THE SUN WITH \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eANTLIA\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eFILTER\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eS\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSerious eye damage will result if you\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003efail to observe the warning.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and band-pass parameters to achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e3nm Pro \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003efilter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e signal. Such filters are more difficult to produce to a consistently high standard.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eEach filter is individually tested and scanned to ensure that the quality meets the high-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013692256367,"sku":"ANT-OIII-1","price":384.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/OIII_252520125__91669.1682635786.1280.1280.jpg?v=1766559897"},{"product_id":"antlia-3nm-narrowband-oxygen-iii-oiii-pro-filter-36mm","title":"Antlia 3nm Narrowband Oxygen III (OIII) Pro Filter - 36mm","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eAntlia OIII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cins cite=\"mailto:Ted%20Dobosz\" datetime=\"2021-01-06T13:06\" style=\"text-size-adjust: 100%;\"\u003e\u003c\/ins\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ebandpass\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eOIII\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eare\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e designed to deliver \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e85\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e% transmission at the 500.7nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eshift\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e We guarantee T\u0026gt;\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e85\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e% within 1nm range of the center bandwidth, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eB\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003elue\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eloss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e5\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e (0.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e00\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSNR(\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003esignal to noise ratio\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e)\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e and effective cut\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eoff rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eImproved sharp cut\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eoff astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eApplication and Performance:\u003c\/span\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e to maximize\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003econtrast\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eNarrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eExtend\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eimaging time when the moon is up\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003edown \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eto F\/3\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e systems\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003ewith slight loss of signal\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eAll A\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003entlia\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eThis filter is not suited to deep sky objects that do not contain OIII emissions.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e\u003cspan style=\"font-size: 14px;\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSolar Observing and imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eVisual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eDO NOT LOOK AT THE SUN WITH \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eANTLIA\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eFILTER\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eS\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSerious eye damage will result if you\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003efail to observe the warning.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and band-pass parameters to achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e3nm Pro \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003efilter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e signal. Such filters are more difficult to produce to a consistently high standard.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eEach filter is individually tested and scanned to ensure that the quality meets the high-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013692584047,"sku":"ANT-OIII-36","price":459.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/OIII_25252036__31234.1682635787.1280.1280.jpg?v=1766559904"},{"product_id":"antlia-3nm-narrowband-oxygen-iii-oiii-pro-filter-2","title":"Antlia 3nm Narrowband Oxygen III (OIII) Pro Filter - 2\"","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eAntlia OIII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cins cite=\"mailto:Ted%20Dobosz\" datetime=\"2021-01-06T13:06\" style=\"text-size-adjust: 100%;\"\u003e\u003c\/ins\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ebandpass\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eOIII\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eare\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e designed to deliver \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e85\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e% transmission at the 500.7nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eshift\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e We guarantee T\u0026gt;\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e85\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e% within 1nm range of the center bandwidth, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eB\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003elue\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eloss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e5\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e (0.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e00\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSNR(\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003esignal to noise ratio\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e)\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e and effective cut\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eoff rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eImproved sharp cut\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eoff astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eApplication and Performance:\u003c\/span\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e to maximize\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003econtrast\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eNarrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eExtend\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eimaging time when the moon is up\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003edown \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eto F\/3\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e systems\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003ewith slight loss of signal\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eAll A\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003entlia\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eThis filter is not suited to deep sky objects that do not contain OIII emissions.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e\u003cspan style=\"font-size: 14px;\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSolar Observing and imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eVisual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eDO NOT LOOK AT THE SUN WITH \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eANTLIA\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eFILTER\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eS\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSerious eye damage will result if you\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003efail to observe the warning.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and band-pass parameters to achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e3nm Pro \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003efilter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e signal. Such filters are more difficult to produce to a consistently high standard.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eEach filter is individually tested and scanned to ensure that the quality meets the high-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013692616815,"sku":"ANT-OIII-2","price":599.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/OIII_252520125__23190.1682635787.1280.1280.jpg?v=1766559909"},{"product_id":"antlia-3nm-narrowband-h-alpha-ha-pro-filter-1-25","title":"Antlia 3nm Narrowband H-alpha (Ha) Pro Filter - 1.25''","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eAntlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e bandpass\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eare\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e designed to deliver 88\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;88% within 1nm range of the center bandwidth,\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eB\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003elue\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e-\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e5\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e (0.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e00\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSNR(\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003esignal to noise ratio\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e)\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eImproved \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eHigh transmittance and smallest bandwidth \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eto maximize \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003econtrast\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eUse in light polluted areas and\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003edark sites\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eExtend\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eimaging time when the moon is up\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003edown \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eto F\/3\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e systems\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003ewith slight loss of signal\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eAll A\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003entlia\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e emissions.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSolar Observing and imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eVisual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eDO NOT LOOK AT THE SUN WITH \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eANTLIA\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eFILTER\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eS\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSerious eye damage will result if you\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003efail to observe the warning.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and band-pass parameters to achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e3nm Pro \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003efilter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e signal. Such filters are more difficult to produce to a consistently high standard.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eEach filter is individually tested and scanned to ensure that the quality meets the high-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013692747887,"sku":"ANT-Ha-1","price":344.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Ha__51664.jpg?v=1766559915"},{"product_id":"antlia-3nm-narrowband-h-alpha-ha-pro-filter-2","title":"Antlia 3nm Narrowband H-alpha (Ha) Pro Filter -2\"","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eAntlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e bandpass\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eare\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e designed to deliver 88\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;88% within 1nm range of the center bandwidth,\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eB\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003elue\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e-\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e5\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e (0.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e00\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSNR(\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003esignal to noise ratio\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e)\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eImproved \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eHigh transmittance and smallest bandwidth \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eto maximize \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003econtrast\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eUse in light polluted areas and\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003edark sites\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eExtend\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eimaging time when the moon is up\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003edown \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eto F\/3\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e systems\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003ewith slight loss of signal\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eAll A\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003entlia\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e emissions.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSolar Observing and imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eVisual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eDO NOT LOOK AT THE SUN WITH \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eANTLIA\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eFILTER\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eS\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSerious eye damage will result if you\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003efail to observe the warning.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and band-pass parameters to achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e3nm Pro \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003efilter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e signal. Such filters are more difficult to produce to a consistently high standard.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eEach filter is individually tested and scanned to ensure that the quality meets the high-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013693075567,"sku":"ANT-Ha-2","price":549.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Ha__93823.jpg?v=1766559920"},{"product_id":"antlia-3nm-narrowband-h-alpha-ha-pro-filter-36mm","title":"Antlia 3nm Narrowband H-alpha (Ha) Pro Filter - 36mm","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eAntlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e bandpass\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eare\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e designed to deliver 88\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;88% within 1nm range of the center bandwidth,\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eB\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003elue\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e-\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e5\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e (0.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e00\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSNR(\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003esignal to noise ratio\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e)\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eImproved \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eHigh transmittance and smallest bandwidth \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eto maximize \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003econtrast\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eUse in light polluted areas and\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003edark sites\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eExtend\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003es\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eimaging time when the moon is up\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003edown \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eto F\/3\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e systems\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; line-height: 14.82px; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003ewith slight loss of signal\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eAll A\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003entlia\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; line-height: 14.82px; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; line-height: 14.82px; font-size: 13px;\"\u003e emissions.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSolar Observing and imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eVisual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eDO NOT LOOK AT THE SUN WITH \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eANTLIA\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eFILTER\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eS\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSerious eye damage will result if you\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003efail to observe the warning.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and band-pass parameters to achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e3nm Pro \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003efilter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eH-alpha\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e signal. Such filters are more difficult to produce to a consistently high standard.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eEach filter is individually tested and scanned to ensure that the quality meets the high-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013693141103,"sku":"ANT-Ha-36","price":424.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ha_25252036__27541.1682635789.1280.1280.jpg?v=1766559927"},{"product_id":"antlia-3nm-narrowband-sulfur-ii-sii-pro-filter-1-25","title":"Antlia 3nm Narrowband Sulfur II (SII) Pro Filter - 1.25''","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eAntlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSII \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ePro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e3nm \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ePro \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003enarrowband \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003efilters enhance contrast of emission targets by lowering the unwanted background signal. Antlia SII\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003e3nm Pro\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e filter is designed to deliver 88% transmission at the 671.6nm line\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003ewhich\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e provides you with the maximum signal and well defined nebulae structures\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong (Center Wavelength (CWL)-shift\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eWe guarantee T\u0026gt;88% within 1nm range of the center bandwidth\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e,\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003e. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eB\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003elue\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e-\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eshift data show that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e5\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e (0.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e00\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSNR(\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003esignal to noise ratio\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e)\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eImproved\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003esharp cut-off\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 3em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e to maximize\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003econtrast\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eNarrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px; text-indent: 26px;\"\u003eExtend imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eAll Antlia narrowband Pro filters can be used \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003edown \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eto F\/3 with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eAll Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSuperior optical reliability reduces post image processing\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSII\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eemissions.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial; text-indent: 0em;\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSolar Observing and imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eVisual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eDO NOT LOOK AT THE SUN WITH \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eANTLIA\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eFILTER\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eS\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSerious eye damage will result if you\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003efail to observe the warning.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 21px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003etogether\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-family: Arial; font-size: 13px;\"\u003e with optical systems\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003e, carefully \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-family: Arial; font-size: 13px;\"\u003edesigning the \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003eblocking and band-pass \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-family: Arial; font-size: 13px;\"\u003eparameters \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003eto achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia SII 3nm Pro filter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the SII signal. Such filters are more difficult to produce to a consistently high standard.\u003c\/span\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eEach filter is individually tested and scanned to ensure that the quality meets \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ethe \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003ehigh-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013694451823,"sku":"ANT-SII-1","price":344.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/OIII_252520125__23667.1682635790.1280.1280.jpg?v=1766559933"},{"product_id":"antlia-3nm-narrowband-sulfur-ii-sii-pro-filter-2","title":"Antlia 3nm Narrowband Sulfur II (SII) Pro Filter - 2\"","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eAntlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSII \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ePro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e3nm \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ePro \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003enarrowband \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003efilters enhance contrast of emission targets by lowering the unwanted background signal. Antlia SII\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003e3nm Pro\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e filter is designed to deliver 88% transmission at the 671.6nm line\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003ewhich\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e provides you with the maximum signal and well defined nebulae structures\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong (Center Wavelength (CWL)-shift\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eWe guarantee T\u0026gt;88% within 1nm range of the center bandwidth\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e,\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003e. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eB\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003elue\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e-\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eshift data show that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e5\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e (0.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e00\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSNR(\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003esignal to noise ratio\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e)\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eImproved\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003esharp cut-off\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 3em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e to maximize\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003econtrast\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eNarrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px; text-indent: 26px;\"\u003eExtend imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eAll Antlia narrowband Pro filters can be used \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003edown \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eto F\/3 with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eAll Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSuperior optical reliability reduces post image processing\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSII\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eemissions.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial; text-indent: 0em;\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSolar Observing and imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eVisual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eDO NOT LOOK AT THE SUN WITH \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eANTLIA\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eFILTER\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eS\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSerious eye damage will result if you\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003efail to observe the warning.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 21px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003etogether\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-family: Arial; font-size: 13px;\"\u003e with optical systems\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003e, carefully \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-family: Arial; font-size: 13px;\"\u003edesigning the \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003eblocking and band-pass \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-family: Arial; font-size: 13px;\"\u003eparameters \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003eto achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia SII 3nm Pro filter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the SII signal. Such filters are more difficult to produce to a consistently high standard.\u003c\/span\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eEach filter is individually tested and scanned to ensure that the quality meets \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ethe \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003ehigh-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013694582895,"sku":"ANT-SII-2","price":549.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/OIII_252520125__78030.1682635790.1280.1280.jpg?v=1766559938"},{"product_id":"antlia-3nm-narrowband-sulfur-ii-sii-pro-filter-36mm","title":"Antlia 3nm Narrowband Sulfur II (SII) Pro Filter - 36mm","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eAntlia \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSII \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ePro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e3nm \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ePro \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003enarrowband \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003efilters enhance contrast of emission targets by lowering the unwanted background signal. Antlia SII\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003e3nm Pro\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e filter is designed to deliver 88% transmission at the 671.6nm line\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003ewhich\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e provides you with the maximum signal and well defined nebulae structures\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 7px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong (Center Wavelength (CWL)-shift\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eWe guarantee T\u0026gt;88% within 1nm range of the center bandwidth\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e,\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003e. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eB\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003elue\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e-\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eshift data show that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e5\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e (0.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e00\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSNR(\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003esignal to noise ratio\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e)\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eImproved\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003esharp cut-off\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 3em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e to maximize\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003econtrast\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eNarrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px; text-indent: 26px;\"\u003eExtend imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eAll Antlia narrowband Pro filters can be used \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003edown \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eto F\/3 with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eAll Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSuperior optical reliability reduces post image processing\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 10px 28px 0px 0px; font-family: ????; font-size: 14px; text-indent: 0em; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eSII\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eemissions.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: Arial; text-indent: 0em;\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 15px;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSolar Observing and imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eVisual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eDO NOT LOOK AT THE SUN WITH \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eANTLIA\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eFILTER\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eS\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003eSerious eye damage will result if you\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: ??; font-size: 13px;\"\u003e \u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003efail to observe the warning.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 21px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-family: ??; font-size: 13px;\"\u003e \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003etogether\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-family: Arial; font-size: 13px;\"\u003e with optical systems\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003e, carefully \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-family: Arial; font-size: 13px;\"\u003edesigning the \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003eblocking and band-pass \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-family: Arial; font-size: 13px;\"\u003eparameters \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; text-align: justify; font-size: 13px; font-family: Arial;\"\u003eto achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia SII 3nm Pro filter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the SII signal. Such filters are more difficult to produce to a consistently high standard.\u003c\/span\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px 28px 13px 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: normal;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003eEach filter is individually tested and scanned to ensure that the quality meets \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003ethe \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003ehigh-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013694615663,"sku":"ANT-SII-36","price":424.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sII_25252036__69244.1682635791.1280.1280.jpg?v=1766559944"},{"product_id":"antlia-4-5nm-narrowband-sulfur-ii-sii-edge-filter-1-25","title":"Antlia 4.5nm Narrowband Sulfur II (SII) EDGE Filter - 1.25\"","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia SII EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia SII 4.5nm EGDE filters are designed to deliver high transmittance at the 671.6nm line that provides you with the maximum signal to reveal the faintest SII nebulae structures.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;90% within 1nm range of the center bandwidth, which means that the SII 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eNarrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eUse in light polluted areas and dark sites Extend imaging time when the moon is up\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eThis filter is only effective for deep sky objects that contain SII emissions\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eFilter Thickness: 2mm+\/-0.05mm for 1.25\"\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eCWL (Central Wavelength): 671.6nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003ePeak Transmission: \u0026gt;90%\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eBlocking: \u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eTransmitted Wavefront: Lambda\/4 or better. Parallelism: less than 30 arcsec\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eSpectrum Curve:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cspan class=\"J_hoverImageParent\" style=\"text-size-adjust: 100%; display: inline-block; width: 1346px; height: 768px; position: relative;\"\u003e\u003cimg class=\"hoverImage need_fix\" id=\"hoverImg_ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY_170c0f88-6fb7-4b7d-89f1-940ab8fe93e1.jpg?v=1766561331\" _defimg=\"\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY.jpg\" _hovimg=\"\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY.jpg\" width=\"1346\" height=\"768\" alt=\" \" style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important; opacity: 1;\"\u003e\u003cimg class=\"J_hoverImage\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY_170c0f88-6fb7-4b7d-89f1-940ab8fe93e1.jpg?v=1766561331\" title=\"\" alt=\"\" style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: 768px; position: absolute; opacity: 0; top: 0px; left: 0px; width: 1346px;\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eN\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eNight visual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the out of band blocking rate, transmittance and band-pass parameters to achieve an optimum result. Each filter is individually tested and scanned by strict QC to ensure that the quality meets the high-performance parameters. The result is that Antlia is known for designing filters for astrophotography that achieve exceptional quality and performance parameters at affordable prices. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013739769967,"sku":"ANT-SII-4.5-1","price":249.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ant-sii-1-edge__79536.jpg?v=1766561336"},{"product_id":"antlia-4-5nm-narrowband-sulfur-ii-sii-edge-filter-2","title":"Antlia 4.5nm Narrowband Sulfur II (SII) EDGE Filter - 2\"","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia SII EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia SII 4.5nm EGDE filters are designed to deliver high transmittance at the 671.6nm line that provides you with the maximum signal to reveal the faintest SII nebulae structures.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;90% within 1nm range of the center bandwidth, which means that the SII 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eNarrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eUse in light polluted areas and dark sites Extend imaging time when the moon is up\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eThis filter is only effective for deep sky objects that contain SII emissions\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eFilter Thickness: 2mm+\/-0.05mm for 2\"\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eCWL (Central Wavelength): 671.6nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003ePeak Transmission: \u0026gt;90%\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eBlocking: \u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eTransmitted Wavefront: Lambda\/4 or better. Parallelism: less than 30 arcsec\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eSpectrum Curve:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cspan class=\"J_hoverImageParent\" style=\"text-size-adjust: 100%; display: inline-block; width: 1346px; height: 768px; position: relative;\"\u003e\u003cimg class=\"hoverImage need_fix\" id=\"hoverImg_ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY_777f7efb-dca9-44a9-9a19-2fca4ed74c07.jpg?v=1766561342\" _defimg=\"\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY.jpg\" _hovimg=\"\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY.jpg\" width=\"1346\" height=\"768\" alt=\" \" style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important; opacity: 1;\"\u003e\u003cimg class=\"J_hoverImage\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY_777f7efb-dca9-44a9-9a19-2fca4ed74c07.jpg?v=1766561342\" title=\"\" alt=\"\" style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: 768px; position: absolute; opacity: 0; top: 0px; left: 0px; width: 1346px;\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eN\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eNight visual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the out of band blocking rate, transmittance and band-pass parameters to achieve an optimum result. Each filter is individually tested and scanned by strict QC to ensure that the quality meets the high-performance parameters. The result is that Antlia is known for designing filters for astrophotography that achieve exceptional quality and performance parameters at affordable prices. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013739999343,"sku":"ANT-SII-4.5-2","price":394.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ant-sii-2-edge__84869.jpg?v=1766561346"},{"product_id":"antlia-4-5nm-narrowband-sulfur-ii-sii-edge-filter-36mm","title":"Antlia 4.5nm Narrowband Sulfur II (SII) EDGE Filter - 36mm","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia SII EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia SII 4.5nm EGDE filters are designed to deliver high transmittance at the 671.6nm line that provides you with the maximum signal to reveal the faintest SII nebulae structures.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;90% within 1nm range of the center bandwidth, which means that the SII 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eNarrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eUse in light polluted areas and dark sites Extend imaging time when the moon is up\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eThis filter is only effective for deep sky objects that contain SII emissions\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eFilter Thickness: 2mm+\/-0.05mm for 36mm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eCWL (Central Wavelength): 671.6nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003ePeak Transmission: \u0026gt;90%\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eBlocking: \u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eTransmitted Wavefront: Lambda\/4 or better. Parallelism: less than 30 arcsec\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eSpectrum Curve:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cspan class=\"J_hoverImageParent\" style=\"text-size-adjust: 100%; display: inline-block; width: 1346px; height: 768px; position: relative;\"\u003e\u003cimg class=\"hoverImage need_fix\" id=\"hoverImg_ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY_efd64890-f321-4448-b416-46c50fc4dad8.jpg?v=1766561351\" _defimg=\"\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY.jpg\" _hovimg=\"\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY.jpg\" width=\"1346\" height=\"768\" alt=\" \" style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important; opacity: 1;\"\u003e\u003cimg class=\"J_hoverImage\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ABUIABACGAAghoqZkQYozeKEwgIwwgo4gAY_efd64890-f321-4448-b416-46c50fc4dad8.jpg?v=1766561351\" title=\"\" alt=\"\" style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: 768px; position: absolute; opacity: 0; top: 0px; left: 0px; width: 1346px;\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eN\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eNight visual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the out of band blocking rate, transmittance and band-pass parameters to achieve an optimum result. Each filter is individually tested and scanned by strict QC to ensure that the quality meets the high-performance parameters. The result is that Antlia is known for designing filters for astrophotography that achieve exceptional quality and performance parameters at affordable prices. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013740130415,"sku":"ANT-SII-4.5-36","price":304.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ant-sii-36-edge__41545.jpg?v=1766561355"},{"product_id":"antlia-4-5nm-narrowband-oxygen-iii-oiii-edge-filter-36mm-unmounted","title":"Antlia 4.5nm Narrowband Oxygen III (OIII) EDGE Filter - 36mm Unmounted","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia OIII EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images. Antlia OIII 4.5nm EDGE filters are designed to deliver 85% transmission at the 500.7nm line that provides you with the maximum signal to reveal the faintest OIII nebulae structures.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;85% within 1nm range of the center bandwidth, which means that the OIII 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eNarrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eUse in light polluted areas and dark sites Extends imaging time when the moon is up\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light Superior optical reliability reduces post image processing\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eThis filter is only effective for deep sky objects that contain OIII emissions\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eFilter Thickness: 2mm+\/-0.05mm for Dia36mm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eCWL (Central Wavelength): 500.7nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003ePeak Transmission: \u0026gt;85% Blocking: \u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eTransmitted Wavefront: Lambda\/4 or better. Parallelism: less than 30 arcsec\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eSpectrum Curve:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ABUIABACGAAg9ouZkQYogL624gMwvwo4gQY_3e8a7879-7019-4905-97de-a5d875883ee5.jpg?v=1766561360\" width=\"1343\" height=\"769\" alt=\"Antlia OIII 4.5nm EDGE curve.jpg\" class=\"need_fix\" style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eN\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eot Recommended:\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eNight visual observation\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the out of band blocking rate, transmittance and band-pass parameters to achieve an optimum result. Each filter is individually tested and scanned by strict QC to ensure that the quality meets the high-performance parameters. The result is that Antlia is known for designing filters for astrophotography that achieve exceptional quality and performance parameters at affordable prices. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013740195951,"sku":"ANT-OIII-4.5-36","price":282.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ant-oiii-36-edge__04413.jpg?v=1766561362"},{"product_id":"antlia-4-5nm-narrowband-oxygen-iii-oiii-edge-filter-2","title":"Antlia 4.5nm Narrowband Oxygen III (OIII) EDGE Filter - 2\"","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia OIII EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images. Antlia OIII 4.5nm EDGE filters are designed to deliver 85% transmission at the 500.7nm line that provides you with the maximum signal to reveal the faintest OIII nebulae structures.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;85% within 1nm range of the center bandwidth, which means that the OIII 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eNarrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eUse in light polluted areas and dark sites Extends imaging time when the moon is up\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light Superior optical reliability reduces post image processing\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eThis filter is only effective for deep sky objects that contain OIII emissions\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eFilter Thickness: 2mm+\/-0.05mm for 2\"\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eCWL (Central Wavelength): 500.7nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003ePeak Transmission: \u0026gt;85% Blocking: \u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eTransmitted Wavefront: Lambda\/4 or better. Parallelism: less than 30 arcsec\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eSpectrum Curve:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ABUIABACGAAg9ouZkQYogL624gMwvwo4gQY_b94b94ae-f27e-4465-813c-269fd2279499.jpg?v=1766561368\" width=\"1343\" height=\"769\" alt=\"Antlia OIII 4.5nm EDGE curve.jpg\" class=\"need_fix\" style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eN\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eot Recommended:\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eNight visual observation\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the out of band blocking rate, transmittance and band-pass parameters to achieve an optimum result. Each filter is individually tested and scanned by strict QC to ensure that the quality meets the high-performance parameters. The result is that Antlia is known for designing filters for astrophotography that achieve exceptional quality and performance parameters at affordable prices. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013740851311,"sku":"ANT-OIII-4.5-2","price":394.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ant-oiii-2-edge__51278.jpg?v=1766561370"},{"product_id":"antlia-4-5nm-narrowband-oxygen-iii-oiii-edge-filter-1-25","title":"Antlia 4.5nm Narrowband Oxygen III (OIII) EDGE Filter - 1.25\"","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia OIII EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images. Antlia OIII 4.5nm EDGE filters are designed to deliver 85% transmission at the 500.7nm line that provides you with the maximum signal to reveal the faintest OIII nebulae structures.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;85% within 1nm range of the center bandwidth, which means that the OIII 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eNarrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eUse in light polluted areas and dark sites Extends imaging time when the moon is up\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light Superior optical reliability reduces post image processing\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eThis filter is only effective for deep sky objects that contain OIII emissions\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eFilter Thickness: 2mm+\/-0.05mm for 1.25\"\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eCWL (Central Wavelength): 500.7nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003ePeak Transmission: \u0026gt;85% Blocking: \u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eTransmitted Wavefront: Lambda\/4 or better. Parallelism: less than 30 arcsec\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eSpectrum Curve:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ABUIABACGAAg9ouZkQYogL624gMwvwo4gQY_4155b0fc-0300-4250-8027-157e03a5a87f.jpg?v=1766561375\" width=\"1343\" height=\"769\" alt=\"Antlia OIII 4.5nm EDGE curve.jpg\" class=\"need_fix\" style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eN\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eot Recommended:\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eNight visual observation\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the out of band blocking rate, transmittance and band-pass parameters to achieve an optimum result. Each filter is individually tested and scanned by strict QC to ensure that the quality meets the high-performance parameters. The result is that Antlia is known for designing filters for astrophotography that achieve exceptional quality and performance parameters at affordable prices. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013741408367,"sku":"ANT-OIII-4.5-1.25","price":249.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ant-oiii-1-edge__39770.jpg?v=1766561377"},{"product_id":"antlia-4-5nm-narrowband-h-alpha-ha-edge-filter-36mm-unmounted","title":"Antlia 4.5nm Narrowband H-alpha (Ha) EDGE Filter - 36mm Unmounted","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia H-alpha EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia H-alpha 4.5nm EGDE filters are designed to deliver high transmittance at the 656.3nm line that provides you with the maximum signal to reveal the faintest H-alpha nebulae structures.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;90% within 1nm range of the center bandwidth, which means that the H-alpha 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eUse in light polluted areas and dark sites\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eExtends imaging time when the moon is up\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eThis filter is only effective for deep sky objects that contain H-alpha emissions\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eFilter Thickness: 2mm+\/-0.05mm for Dia36mm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eCWL (Central Wavelength): 656.3nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003ePeak Transmission:\u0026gt;90% Blocking: \u0026gt; 5 OD (out of band blocking) @ 300-1000nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eTransmitted Wavefront: Lambda\/4 or better. Parallelism: less than 30 arcsec\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eSpectrum Curve:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cimg src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgo5SZkQYonP3zmgYwwQo4gQY.jpg\" width=\"1345\" height=\"769\" alt=\"Antlia H-alpha 4.5nm EDGE curve.jpg\" class=\"need_fix\" style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eN\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eNight visual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the out of band blocking rate, transmittance and band-pass parameters to achieve an optimum result. Each filter is individually tested and scanned by strict QC to ensure that the quality meets the high-performance parameters. The result is that Antlia is known for designing filters for astrophotography that achieve exceptional quality and performance parameters at affordable prices. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013741703279,"sku":"ANT-HA-4.5-36","price":304.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ant-ha-36-edge__98910.jpg?v=1766561385"},{"product_id":"antlia-4-5nm-narrowband-h-alpha-ha-edge-filter-2","title":"Antlia 4.5nm Narrowband H-alpha (Ha) EDGE Filter - 2\"","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia H-alpha EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia H-alpha 4.5nm EGDE filters are designed to deliver high transmittance at the 656.3nm line that provides you with the maximum signal to reveal the faintest H-alpha nebulae structures.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;90% within 1nm range of the center bandwidth, which means that the H-alpha 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eUse in light polluted areas and dark sites\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eExtends imaging time when the moon is up\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eThis filter is only effective for deep sky objects that contain H-alpha emissions\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eFilter Thickness: 2mm+\/-0.05mm for Dia36mm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eCWL (Central Wavelength): 656.3nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003ePeak Transmission:\u0026gt;90% Blocking: \u0026gt; 5 OD (out of band blocking) @ 300-1000nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eTransmitted Wavefront: Lambda\/4 or better. Parallelism: less than 30 arcsec\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eSpectrum Curve:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ABUIABACGAAgo5SZkQYonP3zmgYwwQo4gQY_7eae591d-9c57-4b74-b532-e3dc1961aa24.jpg?v=1766561389\" width=\"1345\" height=\"769\" alt=\"Antlia H-alpha 4.5nm EDGE curve.jpg\" class=\"need_fix\" style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eN\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eNight visual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the out of band blocking rate, transmittance and band-pass parameters to achieve an optimum result. Each filter is individually tested and scanned by strict QC to ensure that the quality meets the high-performance parameters. The result is that Antlia is known for designing filters for astrophotography that achieve exceptional quality and performance parameters at affordable prices. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013741736047,"sku":"ANT-HA-4.5-2","price":394.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ant-ha-2-edge__15986.jpg?v=1766561392"},{"product_id":"antlia-4-5nm-narrowband-h-alpha-ha-edge-filter-1-25","title":"Antlia 4.5nm Narrowband H-alpha (Ha) EDGE Filter - 1.25\"","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia H-alpha EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia H-alpha 4.5nm EGDE filters are designed to deliver high transmittance at the 656.3nm line that provides you with the maximum signal to reveal the faintest H-alpha nebulae structures.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;90% within 1nm range of the center bandwidth, which means that the H-alpha 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eUse in light polluted areas and dark sites\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eExtends imaging time when the moon is up\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003eThis filter is only effective for deep sky objects that contain H-alpha emissions\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eFilter Thickness: 2mm+\/-0.05mm for 1.25\"\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eCWL (Central Wavelength): 656.3nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003ePeak Transmission:\u0026gt;90% Blocking: \u0026gt; 5 OD (out of band blocking) @ 300-1000nm\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eTransmitted Wavefront: Lambda\/4 or better. Parallelism: less than 30 arcsec\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eSpectrum Curve:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ABUIABACGAAgo5SZkQYonP3zmgYwwQo4gQY_1aa1024b-2e48-42b9-b2a8-0ce227053b79.jpg?v=1766561397\" width=\"1345\" height=\"769\" alt=\"Antlia H-alpha 4.5nm EDGE curve.jpg\" class=\"need_fix\" style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eN\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eot Recommended:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eNight visual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(251, 140, 0);\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em; text-align: justify;\"\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(0, 0, 0);\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the out of band blocking rate, transmittance and band-pass parameters to achieve an optimum result. Each filter is individually tested and scanned by strict QC to ensure that the quality meets the high-performance parameters. The result is that Antlia is known for designing filters for astrophotography that achieve exceptional quality and performance parameters at affordable prices. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013742162031,"sku":"ANT-HA-4.5-1","price":249.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ant-ha-1-edge__59227.jpg?v=1766561399"},{"product_id":"antlia-h-beta-oiii-filter-for-visual-photography-1-25","title":"Antlia H-Beta \u0026 OIII Filter for Visual \u0026 Photography - 1.25\"","description":"\u003cp\u003eThe Antlia HB-OIII filter is engineered specifically for night visual nebulae observation at high contrast as well as deep-sky astrophotography. Its transmission is 90% or greater at critical wavelengths (OIII 500.7nm, OIII 495.9nm, and H-Beta 486.1nm). You’ll notice a contrast boost to observe Planetary Nebula, Supernova Remnant, Emission Nebula, Diffuse Nebula, and extremely faint nebulae by Antlia HB-OIII filter. When it is used for deep-sky imaging, it enhances the details of the OIII and H-Beta emission lines with astronomical cameras and DSLRs.\u003c\/p\u003e\n\u003cp\u003eThe Antlia HB-OIII filter was coated with optical density (OD) 4 for almost total suppression of unwanted wavelengths, and the filter cut-off wavelength is 300-1000nm, which meets the spectral requirements of photographic cameras and further enhances the suppression of the IR region. Compared with the visual filters that have a cut-off depth of OD3@350-750nm, it performs better to darken the sky background and make deep-sky observation and photography of nebulae, star clusters, and galaxies more easily.\u003c\/p\u003e\n\u003cp\u003eThe HB-OIII filter helps faint objects become much more visible against the blackened background and produces near-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under both light-polluted and dark skies with enough aperture. Since human eyes are less sensitive at night, large aperture telescopes are recommended to gather light and funnel it into the observer's eyes for the best results.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCenter Wavelength for OIII: 500.7nm \u0026amp; 495.9nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eCenter Wavelength for H-Beta: 486.1nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003ePeak Transmission: \u0026gt;90%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eTransmitted Wave Front: Lambda\/4 or better\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eParallelism: less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eOD4 @ 300 - 1000nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eFilter Size: 1.25\" Mounted (28.5*0.6)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44014040350831,"sku":"ANT-HB-OIII-1","price":135.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/hb_oiii_visual__14477.png?v=1766568512"}],"url":"https:\/\/ontariotelescope.com\/collections\/narrowband-antlia.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}