{"title":"Dual \u0026 Multi-Band Filters","description":"","products":[{"product_id":"idas-nebula-booster-nb1-tri-colour-filter","title":"IDAS Nebula Booster NB1 Tri-colour Filter","description":"\u003cdiv\u003e\n\u003cp style=\"font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);\"\u003eIDAS NB Filters are designed to enhance the contrast of emission nebula, yet accommodate the filter spectral shift\u003csup\u003e*\u003c\/sup\u003ewhen used with modern fast optical systems.\u003c\/p\u003e\n\u003cp style=\"font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);\"\u003eFeatures include:\u003c\/p\u003e\n\u003cul style=\"font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);\"\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass\u003c\/li\u003e\n\u003cli\u003eExcellent in-band transmission\u003c\/li\u003e\n\u003cli\u003eExtremely steep bandpass edges minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eAvailable in 52mm and 48mm sizes\u003c\/li\u003e\n\u003cli\u003e2.5mm thickness (parfocal with other IDAS LPS filters)\u003c\/li\u003e\n\u003cli\u003eIDAS-proprietary \u003ca href=\"https:\/\/www.sciencecenter.net\/hutech\/idas\/idastech.htm\"\u003eIGAD\/MBT\/UFP\u003c\/a\u003equality\u003c\/li\u003e\n\u003cli\u003eMade in Japan\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cspan style=\"font-family: Arial, Helvetica, sans-serif; font-size: 10pt;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv\u003e\n\u003csup style=\"font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);\"\u003e*\u003c\/sup\u003e\u003cspan style=\"font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);\"\u003e All interference filters are subject to a bandpass spectral shift which depends on the angle of incidence of the incoming light. IDAS NB filters are designed to accommodate the spectral shift of modern fast optical systems.\u003c\/span\u003e\u003cp style=\"font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);\"\u003eWhen placed in front of an optical system, the spectral shift is determined by the focal length of the optics and the size of the imaging sensor. For an APS-C sensor, up to a 50mm focal length can be accommodated. For a full-frame sized sensor, up to an 80mm focal length can be used.\u003c\/p\u003e\n\u003cp style=\"font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);\"\u003eFor filters placed between the optical system and imaging sensor, the situation is more complex. IDAS NB filters are designed with modern fast optics in mind and can accommodate an angle of incidence of up to 14°.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Idas Filters","offers":[{"title":"Default Title","offer_id":44013466878063,"sku":"NB1-48","price":329.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/IDAS_252520_252520_252520Nebula_252520Booster_252520_252520_252520NB1_252520_25252048mm_252520_252520_252520IGAD_252520_252520_252520Japan_252520v4__86067.1682635219.1280.1280.png?v=1766553916"},{"product_id":"l-enhance-1-25","title":"L-eNhance 1.25\"","description":"\u003ch4 style=\"margin: 10px 0px; font-family: Arial, sans-serif; line-height: 20px; color: rgb(48, 48, 48); text-rendering: optimizelegibility; font-size: 19.0667px; background-color: rgb(255, 255, 255); text-align: justify;\"\u003e\u003cspan style=\"color: rgb(153, 51, 0);\"\u003eAbout L-eNhance Filter\u003c\/span\u003e\u003c\/h4\u003e\u003cp style=\"margin: 0px 0px 15px; font-family: Arial, sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); text-align: justify;\"\u003e\u003cspan style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\"\u003e\u003cspan style=\"color: rgb(25, 31, 37); white-space: pre-wrap;\"\u003eThe relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astro photographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel.\u003c\/span\u003e\u003c\/span\u003e\u003cbr style=\"color: rgb(25, 31, 37); font-family: \" microsoft yahei ui system-ui roboto sans neue sans-serif tahoma symbol font-size: white-space: pre-wrap background-color: rgb\u003e\u003cbr style=\"color: rgb(25, 31, 37); font-family: \" microsoft yahei ui system-ui roboto sans neue sans-serif tahoma symbol font-size: white-space: pre-wrap background-color: rgb\u003e\u003cspan style=\"color: rgb(25, 31, 37); font-family: arial, helvetica, sans-serif; font-size: 10pt; white-space: pre-wrap;\"\u003eL-eNhance provides an economical and practical solution for amateurs. It is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and CCD cameras. The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas. \u003c\/span\u003e\u003cbr style=\"color: rgb(25, 31, 37); font-family: \" microsoft yahei ui system-ui roboto sans neue sans-serif tahoma symbol font-size: white-space: pre-wrap background-color: rgb\u003e\u003cbr style=\"color: rgb(25, 31, 37); font-family: \" microsoft yahei ui system-ui roboto sans neue sans-serif tahoma symbol font-size: white-space: pre-wrap background-color: rgb\u003e\u003cspan style=\"color: rgb(25, 31, 37); font-family: arial, helvetica, sans-serif; font-size: 10pt; white-space: pre-wrap;\"\u003eOptolong believes the design of our L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact from light polluted skies.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px 0px 15px; font-family: Arial, sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255);\"\u003e \u003c\/p\u003e\u003ch4 style=\"margin: 10px 0px; font-family: Arial, sans-serif; line-height: 20px; color: rgb(48, 48, 48); text-rendering: optimizelegibility; font-size: 19.0667px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"color: rgb(153, 51, 0);\"\u003eL-eNhance Filter Spectrum Curve\u003c\/span\u003e\u003c\/h4\u003e\u003cp style=\"margin: 0px 0px 15px; font-family: Arial, sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255);\"\u003eAccording to the characteristics of celestial body emission lines and feature of light pollution span of spectrum, Optolong specially designed and optimized dual-band L-eNhance filter in order to retain the prominent color of nebula RGB while blocking out most of light pollution. Spectrum as shown below:\u003c\/p\u003e\u003ctable border=\"1\" style=\"max-width: 100%; background-color: rgb(255, 255, 255); border-collapse: collapse; border-spacing: 0px; color: rgb(0, 0, 0); font-family: Arial, sans-serif; font-size: 14.6667px; width: 824px; height: 187px;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: justify;\"\u003eSubstrate:\u003c\/td\u003e\n\u003ctd style=\"text-align: justify;\"\u003eB270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: justify;\"\u003eThickness:\u003c\/td\u003e\n\u003ctd style=\"text-align: justify;\"\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eTpeak:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003eT\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eBlocking range:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eBlocking depth:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003elight pollution  line blocking \u0026gt;99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eSurface quality:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eTransmitted Wavefront RMS:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: 10pt;\"\u003e?\/4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 10pt;\"\u003eParallelism (arcsec):\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp style=\"margin: 0px 0px 15px; font-family: Arial, sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255);\"\u003e \u003c\/p\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44013529727087,"sku":"L-E-1","price":233.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/opt-enhance-filter__87232.jpg?v=1766554962"},{"product_id":"l-enhance-2","title":"L-eNhance 2\"","description":"\u003ch4 style=\"margin: 10px 0px; font-family: Arial, sans-serif; line-height: 20px; color: rgb(48, 48, 48); text-rendering: optimizelegibility; font-size: 19.0667px; background-color: rgb(255, 255, 255); text-align: justify;\"\u003e\u003cspan style=\"color: rgb(153, 51, 0);\"\u003eAbout L-eNhance Filter\u003c\/span\u003e\u003c\/h4\u003e\u003cp style=\"margin: 0px 0px 15px; font-family: Arial, sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); text-align: justify;\"\u003e\u003cspan style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\"\u003e\u003cspan style=\"color: rgb(25, 31, 37); white-space: pre-wrap;\"\u003eThe relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astro photographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel.\u003c\/span\u003e\u003c\/span\u003e\u003cbr style=\"color: rgb(25, 31, 37); font-family: \" microsoft yahei ui system-ui roboto sans neue sans-serif tahoma symbol font-size: white-space: pre-wrap background-color: rgb\u003e\u003cbr style=\"color: rgb(25, 31, 37); font-family: \" microsoft yahei ui system-ui roboto sans neue sans-serif tahoma symbol font-size: white-space: pre-wrap background-color: rgb\u003e\u003cspan style=\"color: rgb(25, 31, 37); font-family: arial, helvetica, sans-serif; font-size: 10pt; white-space: pre-wrap;\"\u003eL-eNhance provides an economical and practical solution for amateurs. It is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and CCD cameras. The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas. \u003c\/span\u003e\u003cbr style=\"color: rgb(25, 31, 37); font-family: \" microsoft yahei ui system-ui roboto sans neue sans-serif tahoma symbol font-size: white-space: pre-wrap background-color: rgb\u003e\u003cbr style=\"color: rgb(25, 31, 37); font-family: \" microsoft yahei ui system-ui roboto sans neue sans-serif tahoma symbol font-size: white-space: pre-wrap background-color: rgb\u003e\u003cspan style=\"color: rgb(25, 31, 37); font-family: arial, helvetica, sans-serif; font-size: 10pt; white-space: pre-wrap;\"\u003eOptolong believes the design of our L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact from light polluted skies.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px 0px 15px; font-family: Arial, sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255);\"\u003e \u003c\/p\u003e\u003ch4 style=\"margin: 10px 0px; font-family: Arial, sans-serif; line-height: 20px; color: rgb(48, 48, 48); text-rendering: optimizelegibility; font-size: 19.0667px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"color: rgb(153, 51, 0);\"\u003eL-eNhance Filter Spectrum Curve\u003c\/span\u003e\u003c\/h4\u003e\u003cp style=\"margin: 0px 0px 15px; font-family: Arial, sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255);\"\u003eAccording to the characteristics of celestial body emission lines and feature of light pollution span of spectrum, Optolong specially designed and optimized dual-band L-eNhance filter in order to retain the prominent color of nebula RGB while blocking out most of light pollution. Spectrum as shown below:\u003c\/p\u003e\u003ctable border=\"1\" style=\"max-width: 100%; background-color: rgb(255, 255, 255); border-collapse: collapse; border-spacing: 0px; color: rgb(0, 0, 0); font-family: Arial, sans-serif; font-size: 14.6667px; width: 824px; height: 187px;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: justify;\"\u003eSubstrate:\u003c\/td\u003e\n\u003ctd style=\"text-align: justify;\"\u003eB270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: justify;\"\u003eThickness:\u003c\/td\u003e\n\u003ctd style=\"text-align: justify;\"\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eTpeak:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003eT\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eBlocking range:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eBlocking depth:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003elight pollution  line blocking \u0026gt;99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eSurface quality:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eTransmitted Wavefront RMS:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: 10pt;\"\u003e?\/4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 10pt;\"\u003eParallelism (arcsec):\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp style=\"margin: 0px 0px 15px; font-family: Arial, sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255);\"\u003e \u003c\/p\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44013529759855,"sku":"L-E-2","price":296.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/opt-enhance-filter__45168.jpg?v=1766554967"},{"product_id":"zwo-duo-band-filter-1-25","title":"ZWO Duo-Band Filter 1.25\"","description":"\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eZWO Duo-Band Filter is a dual narrowband filter primarily aimed at complementing our range of colour ASI cameras. The Duo-Band filter is aimed at the astronomer who may already own a One Shot Colour (OSC) camera and wants to image using narrowband techniques or emission objects without purchasing a mono camera, filter wheel and narrowband filter set.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eThe Duo-Band filter offers an economical entry into the world of narrowband imaging and can also offer a practical solution to imaging in light polluted urban areas.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eThe dual band pass nature of the Duo-Band filter passes light at Ha (656nm) and OIII (500nm) wavelength, and can reduce the interference from natural light sources such as moonlight, or artificial light pollution such as street lighting.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eIt can help improve the contrast and visibility of deep sky objects such as emission nebula using a OSC camera.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eIf you are looking for a solution to deep sky photography in light pollution area, then ZWO Duo-Band Filter will be a great choice.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eThe Duo-Band filter can be used with all ASI cameras and EFW Electronic Filter Wheel and comes in 1.25” and 2” sizes.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eSize: Standard 1.25”\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eGlass thickness: 1.85 mm\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eBandwidth: HA (15nm) OIII (35nm)\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eSurface quality: 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eSchott substrate material\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eMore than 90% transmission at major OIII line 486.nm1, 496nm and 501nm.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eMore than 80% transmission at Ha line 656.3nm\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eThe incoming light transmitted through the filter should be perpendicular to the filter, or the incident angle should be less than 8°. Therefore, this product is not suitable for wide-angle or ultra wide-angle lenses.\u003ca href=\"https:\/\/astronomy-imaging-camera.com\/wp-content\/uploads\/5.png\" style=\"background: transparent; color: rgb(238, 57, 57);\"\u003e\u003cbr\u003e\u003c\/a\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/incident-light-to-the-filter_d6aea5e9-1adb-4450-98df-5f5a79884f8e.png?v=1766555981\" style=\"background: transparent; color: rgb(238, 57, 57);\"\u003e\u003cimg class=\"aligncenter size-full wp-image-16682\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/incident-light-to-the-filter_d6aea5e9-1adb-4450-98df-5f5a79884f8e.png?v=1766555981\" alt=\"incident-light-to-the-filter\" width=\"645\" height=\"274\" style=\"border: 0px; display: block; text-align: center; margin: auto; height: auto; max-width: 100%; padding: 0px; background: none;\"\u003e\u003c\/a\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003ch2 style=\"position: relative; padding: 0px 0px 10px; line-height: 28px; color: rgb(238, 57, 57); margin: 0px; font-size: 20px; font-family: \" pt sans narrow sans-serif rgb normal background-color:=\"\" font-weight:=\"\"\u003e\u003cspan style=\"color: rgb(255, 0, 0);\"\u003eTest Results\u003c\/span\u003e\u003c\/h2\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eImages captured with ASI color cameras and Duo-Band Filters. You can see that the potential for deep space photography in strong light polluted areas is vastly improved with the Duo-Band filters.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb center font-size:=\"\" background-color:=\"\" text-align:=\"\"\u003e\u003ca href=\"https:\/\/astronomy-imaging-camera.com\/wp-content\/uploads\/%E4%BF%AE%E6%94%B9%EF%BC%883%EF%BC%891.jpg\" style=\"background: transparent; color: rgb(238, 57, 57);\"\u003e\u003cimg class=\"alignnone size-large wp-image-17435\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/E4_BF_AE_E6_94_B9_EF_BC_883_EF_BC_891-947x1024_b3793829-3bc8-4c5d-986a-616a6cd9164a.jpg?v=1766555983\" alt=\"??(3)(1)\" width=\"947\" height=\"1024\" style=\"border: 0px; max-width: 100%; height: auto; display: block;\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/astronomy-imaging-camera.com\/wp-content\/uploads\/Heartwith-without-Duo-Filter1.jpg\" style=\"background: transparent; color: rgb(238, 57, 57);\"\u003e\u003cimg class=\"alignnone wp-image-17409\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Heartwith-without-Duo-Filter1-1024x348_56bed510-5211-4d06-be4a-ab3b41c60a55.jpg?v=1766555984\" alt=\"Heart(with without)-Duo-Filter(1)\" width=\"1124\" height=\"382\" style=\"border: 0px; max-width: 100%; height: auto; display: block;\"\u003e\u003c\/a\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb center font-size:=\"\" background-color:=\"\" text-align:=\"\"\u003e\u003ca href=\"https:\/\/astronomy-imaging-camera.com\/wp-content\/uploads\/%E4%BF%AE%E6%94%B9%EF%BC%881%EF%BC%892.jpg\" style=\"background: transparent; color: rgb(238, 57, 57);\"\u003e\u003cimg class=\"alignnone size-large wp-image-17426\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/E4_BF_AE_E6_94_B9_EF_BC_881_EF_BC_892-947x1024_aed539c2-7d79-4afc-9ade-68edc51e142c.jpg?v=1766555986\" alt=\"??(1)(2)\" width=\"947\" height=\"1024\" style=\"border: 0px; max-width: 100%; height: auto; display: block;\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/astronomy-imaging-camera.com\/wp-content\/uploads\/Horsehead-with-without-Filter1.jpg\" style=\"background: transparent; color: rgb(238, 57, 57);\"\u003e\u003cimg class=\"alignnone size-large wp-image-17411\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Horsehead-with-without-Filter1-1024x671_7acfae2e-dc32-4fe7-a761-4ecd5894da5e.jpg?v=1766555988\" alt=\"Horsehead-(with without)-Filter(1)\" width=\"1024\" height=\"671\" style=\"border: 0px; max-width: 100%; height: auto; display: block;\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44013544734831,"sku":"ZWO-DB-1.25","price":139.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ZWO-Duo-Band-Filter-460x460__72535.jpg?v=1766555990"},{"product_id":"zwo-duo-band-filter-2","title":"ZWO Duo-Band Filter 2\"","description":"\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eZWO Duo-Band Filter is a dual narrowband filter primarily aimed at complementing our range of colour ASI cameras. The Duo-Band filter is aimed at the astronomer who may already own a One Shot Colour (OSC) camera and wants to image using narrowband techniques or emission objects without purchasing a mono camera, filter wheel and narrowband filter set.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eThe Duo-Band filter offers an economical entry into the world of narrowband imaging and can also offer a practical solution to imaging in light polluted urban areas.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eThe dual band pass nature of the Duo-Band filter passes light at Ha (656nm) and OIII (500nm) wavelength, and can reduce the interference from natural light sources such as moonlight, or artificial light pollution such as street lighting.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eIt can help improve the contrast and visibility of deep sky objects such as emission nebula using a OSC camera.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eIf you are looking for a solution to deep sky photography in light pollution area, then ZWO Duo-Band Filter will be a great choice.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eThe Duo-Band filter can be used with all ASI cameras and EFW Electronic Filter Wheel and comes in 1.25” and 2” sizes.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eSize: Standard 2”\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eGlass thickness: 1.85 mm\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eBandwidth: HA (15nm) OIII (35nm)\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eSurface quality: 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eSchott substrate material\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eMore than 90% transmission at major OIII line 486.nm1, 496nm and 501nm.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eMore than 80% transmission at Ha line 656.3nm\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eThe incoming light transmitted through the filter should be perpendicular to the filter, or the incident angle should be less than 8°. Therefore, this product is not suitable for wide-angle or ultra wide-angle lenses.\u003ca href=\"https:\/\/astronomy-imaging-camera.com\/wp-content\/uploads\/5.png\" style=\"background: transparent; color: rgb(238, 57, 57);\"\u003e\u003cbr\u003e\u003c\/a\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/incident-light-to-the-filter_3773c5aa-f002-4da3-a58b-7f85de937a22.png?v=1766555995\" style=\"background: transparent; color: rgb(238, 57, 57);\"\u003e\u003cimg class=\"aligncenter size-full wp-image-16682\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/incident-light-to-the-filter_3773c5aa-f002-4da3-a58b-7f85de937a22.png?v=1766555995\" alt=\"incident-light-to-the-filter\" width=\"645\" height=\"274\" style=\"border: 0px; display: block; text-align: center; margin: auto; height: auto; max-width: 100%; padding: 0px; background: none;\"\u003e\u003c\/a\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003ch2 style=\"position: relative; padding: 0px 0px 10px; line-height: 28px; color: rgb(238, 57, 57); margin: 0px; font-size: 20px; font-family: \" pt sans narrow sans-serif rgb normal background-color:=\"\" font-weight:=\"\"\u003e\u003cspan style=\"color: rgb(255, 0, 0);\"\u003eTest Results\u003c\/span\u003e\u003c\/h2\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb font-size:=\"\" background-color:=\"\"\u003eImages captured with ASI color cameras and Duo-Band Filters. You can see that the potential for deep space photography in strong light polluted areas is vastly improved with the Duo-Band filters.\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb center font-size:=\"\" background-color:=\"\" text-align:=\"\"\u003e\u003ca href=\"https:\/\/astronomy-imaging-camera.com\/wp-content\/uploads\/%E4%BF%AE%E6%94%B9%EF%BC%883%EF%BC%891.jpg\" style=\"background: transparent; color: rgb(238, 57, 57);\"\u003e\u003cimg class=\"alignnone size-large wp-image-17435\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/E4_BF_AE_E6_94_B9_EF_BC_883_EF_BC_891-947x1024_626b2682-aeeb-4189-8ef0-86adb1021193.jpg?v=1766555996\" alt=\"??(3)(1)\" width=\"947\" height=\"1024\" style=\"border: 0px; max-width: 100%; height: auto; display: block;\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/astronomy-imaging-camera.com\/wp-content\/uploads\/Heartwith-without-Duo-Filter1.jpg\" style=\"background: transparent; color: rgb(238, 57, 57);\"\u003e\u003cimg class=\"alignnone wp-image-17409\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Heartwith-without-Duo-Filter1-1024x348_eb3ba235-0757-4867-91f3-b0312ddff1b4.jpg?v=1766555998\" alt=\"Heart(with without)-Duo-Filter(1)\" width=\"1124\" height=\"382\" style=\"border: 0px; max-width: 100%; height: auto; display: block;\"\u003e\u003c\/a\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px; zoom: 1; padding: 0px 0px 16px; color: rgb(32, 32, 32); font-family: \" pt sans sans-serif rgb center font-size:=\"\" background-color:=\"\" text-align:=\"\"\u003e\u003ca href=\"https:\/\/astronomy-imaging-camera.com\/wp-content\/uploads\/%E4%BF%AE%E6%94%B9%EF%BC%881%EF%BC%892.jpg\" style=\"background: transparent; color: rgb(238, 57, 57);\"\u003e\u003cimg class=\"alignnone size-large wp-image-17426\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/E4_BF_AE_E6_94_B9_EF_BC_881_EF_BC_892-947x1024_4aa8c44b-0ed3-4a7f-825b-70a68b1aa166.jpg?v=1766555999\" alt=\"??(1)(2)\" width=\"947\" height=\"1024\" style=\"border: 0px; max-width: 100%; height: auto; display: block;\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/astronomy-imaging-camera.com\/wp-content\/uploads\/Horsehead-with-without-Filter1.jpg\" style=\"background: transparent; color: rgb(238, 57, 57);\"\u003e\u003cimg class=\"alignnone size-large wp-image-17411\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Horsehead-with-without-Filter1-1024x671_dea20f09-d029-40e4-bd12-6815f8c2f799.jpg?v=1766556001\" alt=\"Horsehead-(with without)-Filter(1)\" width=\"1024\" height=\"671\" style=\"border: 0px; max-width: 100%; height: auto; display: block;\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44013545029743,"sku":"ZWO-DB2","price":239.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ZWO-Duo-Band-Filter-460x460__14069.jpg?v=1766556003"},{"product_id":"l-extreme-2-dual-band-filter","title":"L-Extreme 2\" Dual Band Filter","description":"\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e1.  L-eXtreme Introduction\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eL-eXtreme is a two 7nm bandpass filter which can be used with one-shot color cameras like DSLR's (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image a rich emission nebulas, even in bright, light pollution skies. Optolong believes the design of L-eXtreme filter would be better choice for fast systems in competitive price. It isolates the H-Alpha, and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio between nebulae were maximized. For people who is living in very light polluted areas, or when the moon is out, the L-eXtreme will be a good filter.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eUnlike the Optolong L-eNhance filter which is a tri-band (transmits Hb, Ha, and OIII), the L-eXtreme filter is dual band that passes Ha and OIII emission lines. The advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines, as there is no nebula emission lines there. In this case, it isn't letting light pollution come through so that maximize nebulas signal and make the sky background darker while imaging. The L-eXtreme filter should better isolate the emission lines only and better protect from light pollution.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eHydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old, but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much scientific significance, so keeping H and O is meaning for exploration of life.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eTherefore, we highlight H-a, H-b, O3 and O2, and reduce the signal of sulfur.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e \u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e2.Spectrum and Characteristic\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eSbustrate: B270\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThickness: 1.85mm\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eTpeak:  T\u0026gt;90%\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eBlocking range: 300-1000nm\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eBlcoking depth: light pollution  line blocking \u0026gt;99%\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eSurface quality: 60\/40\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eTransmitted Wavefront RMS: ?\/4\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e Parallelism: 30s\u003c\/span\u003e\u003c\/div\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44013587398767,"sku":"LXT-2","price":395.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/OL-L-EXTREME_DSC_1817_300x300__09162.jpg?v=1766557075"},{"product_id":"l-extreme-1-25-dual-band-filter","title":"L-Extreme 1.25\" Dual Band Filter","description":"\u003cspan style=\"color: rgb(20, 23, 26); font-family: system-ui, -apple-system, BlinkMacSystemFont, \" segoe ui roboto ubuntu neue sans-serif pre-wrap rgb font-size:=\"\" white-space:=\"\" background-color:=\"\"\u003eL-eXtreme is a two 7nm bandpass filter which can be used with cameras, it is also more suited for fast systems.  Unlike the L-eNhance filter which is a tri-band (transmits Hb, Ha, and OIII), the L-eXtreme filter is dual band that passes Ha and OIII emission lines.\u003c\/span\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44013587824751,"sku":"LXT-1","price":305.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/OL-L-EXTREME_DSC_1817_300x300__34458.jpg?v=1766557081"},{"product_id":"l-enhance-for-canon-aps-c","title":"L-eNhance for Canon APS-C","description":"\u003ch4 style=\"margin: 10px 0px; font-family: Arial, sans-serif; line-height: 20px; color: rgb(48, 48, 48); text-rendering: optimizelegibility; font-size: 19.0667px; background-color: rgb(255, 255, 255); text-align: justify;\"\u003e\u003cspan style=\"color: rgb(153, 51, 0);\"\u003eAbout L-eNhance Filter\u003c\/span\u003e\u003c\/h4\u003e\u003cp style=\"margin: 0px 0px 15px; font-family: Arial, sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); text-align: justify;\"\u003e\u003cspan style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\"\u003e\u003cspan style=\"color: rgb(25, 31, 37); white-space: pre-wrap;\"\u003eThe relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astro photographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel.\u003c\/span\u003e\u003c\/span\u003e\u003cbr style=\"color: rgb(25, 31, 37); font-family: \" microsoft yahei ui system-ui roboto sans neue sans-serif tahoma symbol font-size: white-space: pre-wrap background-color: rgb\u003e\u003cbr style=\"color: rgb(25, 31, 37); font-family: \" microsoft yahei ui system-ui roboto sans neue sans-serif tahoma symbol font-size: white-space: pre-wrap background-color: rgb\u003e\u003cspan style=\"color: rgb(25, 31, 37); font-family: arial, helvetica, sans-serif; font-size: 10pt; white-space: pre-wrap;\"\u003eL-eNhance provides an economical and practical solution for amateurs. It is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and CCD cameras. The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas. \u003c\/span\u003e\u003cbr style=\"color: rgb(25, 31, 37); font-family: \" microsoft yahei ui system-ui roboto sans neue sans-serif tahoma symbol font-size: white-space: pre-wrap background-color: rgb\u003e\u003cbr style=\"color: rgb(25, 31, 37); font-family: \" microsoft yahei ui system-ui roboto sans neue sans-serif tahoma symbol font-size: white-space: pre-wrap background-color: rgb\u003e\u003cspan style=\"color: rgb(25, 31, 37); font-family: arial, helvetica, sans-serif; font-size: 10pt; white-space: pre-wrap;\"\u003eOptolong believes the design of our L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact from light polluted skies.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"margin: 0px 0px 15px; font-family: Arial, sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255);\"\u003e \u003cspan style=\"color: rgb(255, 0, 0); font-family: \" open sans sans-serif font-size:\u003eNotes: Compatible cameras of L-eNhance EOS-C Clip: 7D2\/82D\/800D\/77D\/70D\/760D\/750D\/700D\/650D\/600D\/60D\/60Da\/550D\/500D\/400D\/100D\/1100D\/1200D\/1300D; For Lens no limit EXCEPT for EF-S lens\u003c\/span\u003e\u003c\/p\u003e\u003ch4 style=\"margin: 10px 0px; font-family: Arial, sans-serif; line-height: 20px; color: rgb(48, 48, 48); text-rendering: optimizelegibility; font-size: 19.0667px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"color: rgb(153, 51, 0);\"\u003eL-eNhance Filter Spectrum Curve\u003c\/span\u003e\u003c\/h4\u003e\u003cp style=\"margin: 0px 0px 15px; font-family: Arial, sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255);\"\u003eAccording to the characteristics of celestial body emission lines and feature of light pollution span of spectrum, Optolong specially designed and optimized dual-band L-eNhance filter in order to retain the prominent color of nebula RGB while blocking out most of light pollution. Spectrum as shown below:\u003c\/p\u003e\u003ctable border=\"1\" style=\"max-width: 100%; background-color: rgb(255, 255, 255); border-collapse: collapse; border-spacing: 0px; color: rgb(0, 0, 0); font-family: Arial, sans-serif; font-size: 14.6667px; width: 824px; height: 187px;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: justify;\"\u003eSubstrate:\u003c\/td\u003e\n\u003ctd style=\"text-align: justify;\"\u003eB270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: justify;\"\u003eThickness:\u003c\/td\u003e\n\u003ctd style=\"text-align: justify;\"\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eTpeak:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003eT\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eBlocking range:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eBlocking depth:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003elight pollution  line blocking \u0026gt;99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eSurface quality:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd style=\"text-align: left;\"\u003eTransmitted Wavefront RMS:\u003c\/td\u003e\n\u003ctd style=\"text-align: left;\"\u003e\u003cspan style=\"font-family: arial, helvetica, sans-serif; font-size: 10pt;\"\u003e?\/4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 10pt;\"\u003eParallelism (arcsec):\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp style=\"margin: 0px 0px 15px; font-family: Arial, sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255);\"\u003e \u003c\/p\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44013595754607,"sku":"L-E-EOS-C","price":332.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/OPTOLONG-EOS-C-L-eNhance-Filter-Dual-band-Pass-Filter-Designed-for-DSLR-CCD-Control-from__05700.jpg?v=1766557332"},{"product_id":"idas-nbx-nebula-boost-filter-48mm","title":"IDAS NBX Nebula Boost Filter - 48mm","description":"\u003cspan style=\"font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);\"\u003eIDAS NBX Filters are designed to enhance the contrast of Ha and OIII emission nebula, yet accommodate the filter spectral shift when used with modern fast optical systems. This dual-band filter is ideal for one-shot color cameras as well as mono-color astronomical cameras.\u003c\/span\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cp style=\"font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);\"\u003eFeatures include:\u003c\/p\u003e\n\u003cul style=\"font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);\"\u003e\n\u003cli\u003eIdeal flat-top bandpass\u003c\/li\u003e\n\u003cli\u003eExcellent in-band transmission\u003c\/li\u003e\n\u003cli\u003eOff-center bandpass accommodates off-axis rays for fast optics (up to F2)\u003c\/li\u003e\n\u003cli\u003eSteep bandpass edges minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eNo IR blocker required\u003c\/li\u003e\n\u003cli\u003eAvailable in 52mm and 48mm sizes\u003c\/li\u003e\n\u003cli\u003e2.5mm thickness (parfocal with other IDAS LPS filters)\u003c\/li\u003e\n\u003cli\u003eIDAS-proprietary \u003ca href=\"https:\/\/www.sciencecenter.net\/hutech\/idas\/idastech.htm\"\u003eIGAD\/MBT\/UFP\u003c\/a\u003e quality\u003c\/li\u003e\n\u003cli\u003eMade in Japan\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Idas Filters","offers":[{"title":"Default Title","offer_id":44013617447023,"sku":"NBX-48","price":399.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/nbx48b_1024x1024__47505.jpg?v=1766557758"},{"product_id":"antlia-alp-t-dual-band-5nm-filter-2-00-mounted","title":"Antlia ALP-T Dual Band 5nm Filter 2.00'' Mounted","description":"\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;\"\u003eThe Antlia ALP-T dual band 5nm filter is a dual line-pass filter which was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's or astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual band filter effectively isolates the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images. The filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post processing efforts to isolate faint details from the background light pollution. As Antlia ALP-T dual band 5nm filter looks golden yellow to the naked eye, we also call it the Golden filter.\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\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: rgb(246, 124, 1);\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\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;\"\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras\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;\"\u003eSuppression of optical density (OD)4.5 on unwanted visual wavelengths adds signal-to-noise\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;\"\u003eExtremely steep bandpass edges minimize internal reflections\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;\"\u003eIdeal flat- top and moderate bandpass reducing spectrum down shifts\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;\"\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\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;\"\u003eGood performance at focal ratios faster than F3.0 with contrast increasing as focal ratioincreases\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;\"\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\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;\"\u003eNear IR (NIR) is blocked up to 1100nm\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\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.7em;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: rgb(227, 108, 10); font-size: 14px;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.7em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.7em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003eNight visual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.7em;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: rgb(227, 108, 10); font-size: 13px;\"\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.7em;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: rgb(227, 108, 10); font-size: 14px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.7em;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: rgb(227, 108, 10); font-size: 14px;\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003eDO NOT LOOK AT THE SUN WITH \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003eANTLIA\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 14px;\"\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; font-size: 14px;\"\u003eFILTER\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003eS\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003eSerious eye damage will result if you\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 14px;\"\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; font-size: 14px;\"\u003efail to observe the warning.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and bandpass 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 unwanted band wavelengths.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\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 signal-to-noise 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\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013702119535,"sku":"ANT-ALP-T-Dual","price":474.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ANT-5nm-1__18363.jpg?v=1766560189"},{"product_id":"antlia-alp-t-dual-narrowband-oiii-5nm-and-h-a-5nm-filter-36mm-round-unmounted","title":"Antlia ALP-T Dual Narrowband OIII (5nm) and H-a (5nm) Filter - 36mm Round Unmounted","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Antlia ALP-T dual band 5nm filter is a dual line-pass filter which was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's or astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual band filter effectively isolates the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images. The filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post processing efforts to isolate faint details from the background light pollution. As Antlia ALP-T dual band 5nm filter looks golden yellow to the naked eye, we also call it the Golden 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\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\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: rgb(246, 124, 1);\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"text-size-adjust: 100%; color: rgb(255, 167, 39);\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eSuppression of optical density (OD)4.5 on unwanted visual wavelengths adds signal-to-noise\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eExtremely steep bandpass edges minimize internal reflections\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eIdeal flat- top and moderate bandpass reducing spectrum down shifts\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eGood performance at focal ratios faster than F3.0 with contrast increasing as focal ratioincreases\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eNear IR (NIR) is blocked up to 1100nm\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\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.7em;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: rgb(227, 108, 10); font-size: 14px;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.7em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12pt;\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.7em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003eNight visual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.7em;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 13px;\"\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.7em;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: rgb(227, 108, 10); font-size: 14px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.7em;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; color: rgb(227, 108, 10); font-size: 14px;\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003eDO NOT LOOK AT THE SUN WITH \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003eANTLIA\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 14px;\"\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; font-size: 14px;\"\u003eFILTER\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003eS\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 14px;\"\u003eSerious eye damage will result if you\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 14px;\"\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; font-size: 14px;\"\u003efail to observe the warning.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and bandpass 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 unwanted band wavelengths.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\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 signal-to-noise 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\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013735444591,"sku":"ANT-ALP-T-DUAL-36","price":399.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/antlia-alp-t-gold-dual-band-5nm-filter-36mm-4-1000x1000w__24104.jpg?v=1766561225"},{"product_id":"antlia-alp-t-dual-band-5nm-highspeed-filter-2-00-mounted","title":"Antlia ALP-T Dual Band 5nm Highspeed Filter - 2.00'' Mounted","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px; font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255); line-height: 1.5em;\"\u003eALP-T Dual Band 5nm Highspeed Filters are further optimized to work with high-speed imaging systems by shifting slightly the passband and center wavelength. Using these highspeed filters between optics f\/2.2 and f\/3.6 shows much stronger and more contrasted in nebulae imaging compared to the standard version.\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;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\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;\"\u003eFor optics f-ratios slower than f\/3.6, the standard ALP-T Dual Band 5nm filter is highly recommended. Meanwhile, if you seek the best possible performance with any optics faster than f\/2.2, the highspeed version is the best choice.\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;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\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;\"\u003eBut keep in mind, the blue shift data by the computer simulation indicates narrowband filter shifts its bandwidth to shorter wavelengths with faster optics than f\/2, transmission at the emission wavelength may decrease perhaps 15%-20%. Although the Antlia ALP-T highspeed filter has similar transmission rates reduction in the H-a and OIII when the filter is used on fast optics, based on current standard version users’ data, it is evident that the filter still has the high performance of increase in emission nebula contrast and minimized halo.\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;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\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;\"\u003eThe highspeed version price is the same as the standard filters and double benefits for the high-speed optics users. Worth mentioning is that Antlia inspected and measured products piece by piece with one of Agilent Cary’s professional spectrophotometer, resolution\/slit width is up to 0.2nm, which make us provide highly reliable and consistent products to you.\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;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\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;\"\u003eThe Antlia ALP-T dual band 5nm series filter is a dual line-pass filter that was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's and astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual band filter effectively isolate the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior 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;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\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;\"\u003eThe filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post-processing efforts to isolate faint details from the background light pollution.\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;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\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;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/strong\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;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%;\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/strong\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;\"\u003eDesigned especially for fast astronomy optics, in particular f-ratios f\/2.2 to f\/3.6\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;\"\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras\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;\"\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\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;\"\u003eExtremely steep bandpass edges minimize 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;\"\u003eIdeal flat-top and moderate bandpass reducing spectrum down shifts\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;\"\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\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;\"\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\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;\"\u003eNear IR (NIR) is blocked up to 1050nm\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;\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan style=\"text-size-adjust: 100%;\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan style=\"text-size-adjust: 100%;\"\u003eNight visual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%;\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan style=\"text-size-adjust: 100%;\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan style=\"text-size-adjust: 100%;\"\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;\"\u003e\u003cbr style=\"text-size-adjust: 100%; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013745373295,"sku":"ANT-ALP-T-Dual-HS","price":474.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/5nm_252520hs_252520dual_252520band__64300.1682635934.1280.1280.jpg?v=1766561553"},{"product_id":"antlia-alp-t-dual-band-5nm-highspeed-filter-36mm","title":"Antlia ALP-T Dual Band 5nm Highspeed 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;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eALP-T Dual Band 5nm Highspeed Filters are further optimized to work with high-speed imaging systems by shifting slightly the passband and center wavelength. Using these highspeed filters between optics f\/2.2 and f\/3.6 shows much stronger and more contrasted in nebulae imaging compared to the standard version.\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\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: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eFor optics f-ratios slower than f\/3.6, the standard ALP-T Dual Band 5nm filter is highly recommended. Meanwhile, if you seek the best possible performance with any optics faster than f\/2.2, the highspeed version is the best choice.\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\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: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eBut keep in mind, the blue shift data by the computer simulation indicates narrowband filter shifts its bandwidth to shorter wavelengths with faster optics than f\/2, transmission at the emission wavelength may decrease perhaps 15%-20%. Although the Antlia ALP-T highspeed filter has similar transmission rates reduction in the H-a and OIII when the filter is used on fast optics, based on current standard version users’ data, it is evident that the filter still has the high performance of increase in emission nebula contrast and minimized halo.\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\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: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe highspeed version price is the same as the standard filters and double benefits for the high-speed optics users. Worth mentioning is that Antlia inspected and measured products piece by piece with one of Agilent Cary’s professional spectrophotometer, resolution\/slit width is up to 0.2nm, which make us provide highly reliable and consistent products to you.\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\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: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Antlia ALP-T dual band 5nm series filter is a dual line-pass filter that was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's and astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual band filter effectively isolate the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\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: 1.5em;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post-processing efforts to isolate faint details from the background light pollution.\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\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: 1.5em;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/strong\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;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/strong\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eDesigned especially for fast astronomy optics, in particular f-ratios f\/2.2 to f\/3.6\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eExtremely steep bandpass edges minimize internal reflections\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eIdeal flat-top and moderate bandpass reducing spectrum down shifts\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eNear IR (NIR) is blocked up to 1050nm\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;\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eNight visual observation\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cstrong style=\"text-size-adjust: 100%;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eNot Permitted:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial;\"\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;\"\u003e\u003cbr style=\"text-size-adjust: 100%; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013745602671,"sku":"ANT-ALP-T-Dual-HS-36","price":399.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/5nm_252520hs_252520dual_252520band_25252036__85187.1682635935.1280.1280.jpg?v=1766561558"},{"product_id":"optolong-l-ultimate-dual-3nm-filter","title":"Optolong L-Ultimate dual-3nm filter","description":"\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003eIt's a 3nm dual band designed to drastically reduce the effect of light pollution, the 3nm isolates the nebulae's emissions into H-Alpha (red) and OIII (green-blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high and low pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere. Maximizes the transmission of the main emission lines of the nebula in OIII (496nm and 500nm) and H-alpha (656nm). Used with DSLR, color\/MONO CMOS and CCD, however, this filter is not suitable for fast ratio systems.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003eThe advantage of L-Ultimate is that it only passes through the emission lines OIII(500.7nm) and Ha(656.3nm), in which case all other light pollution emission lines are eliminated so that only the emission and reflection signals of the nebula are captured during imaging. Therefore, the sky background of the image is darker, and the contrast between the nebulae and the signal-to-noise ratio are improved to the greatest extent. In heavy light pollution areas, the product can also selectively filter light pollution and clutter signals through the emission lines of nebulae, and finally avoid the impact of light pollution on astrophotography.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003eIt is different from the series of dual-narrowband L-eNhance and L-eXtreme in that L-Ultimate is a dual-3nm bandwidth filter that only passes through Ha and OIII emission lines. You will get a darker sky background, more contrast of the image and the suppression on stars. L-Ultimate has also been optimized in terms of halo performance, so that there is no obvious halo when shooting on a bright star object.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-size: 16px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003e\u003cstrong style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eCoating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003eMulti-layers anti-reflection coating\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003eNon-cementing optical substrate coating\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003eOptolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e \u003c\/p\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44013781319791,"sku":"L-Ultimate","price":549.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/L-U1__11666.jpg?v=1766562590"},{"product_id":"antlia-triband-rgb-ultra-filter-2-00-mounted","title":"Antlia Triband RGB Ultra Filter - 2.00'' Mounted","description":"\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 16px; font-family: Arial; font-weight: bold;\"\u003eAntlia Triband RGB Ultra Filter\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 16px; font-family: Arial; font-weight: bold;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eIt is designed for light pollution suppression for OSC and Mono cameras. The spectral \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003edesign selected the most substantial information in the RGB bands, which makes Antlia Triband RGB Ultra Filter possible to shoot over 90% of deep sky objects, in addition to its excellent performance on emission nebula, different from other ultra-narrowband filters, it is able to capture galaxies, reflection nebulae, and star clusters from a Bortle 8 location to Bortle 1 while presenting more balanced RGB colors in your images. Also, it has a broad \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003ebandpass designed to cope with faster optics up to the f\/2 focal ratio.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eThe quantum efficiency of the B channel in current CMOS sensors is often significantly lower than that of R and G channels. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eAntlia team was to provide a filter with a more realistic color balance for astrophotography from light polluted locations. \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eThe problem with the low blue wavelength efficiency becomes apparent when imaging reflection nebulae and blue stars. In \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eCMOS sensors, the blue wavelengths also contain contribution from the stronger green spectrum, thereby affecting the balance \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eof the blue colours. Many popular imaging objects contain reflection nebula with faint blue hues such the central part of\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eNGC2264. Therefore, we designed Antlia Triband RGB Ultra Filter that not only retains the HSO emission signal but also\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eincreases the amount of Luminous flux of the blue B channel. By improving the blue wavelength transmission, the color of the\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003ephoto is better balanced and easier to manage in post processing.\u003c\/span\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 11px; font-family: Arial; font-weight: bold;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-weight: bold; font-family: Arial; font-size: 12px;\"\u003eApplication and Performance:\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eIt is workable to shoot galaxies, reflection nebulae and star clusters.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eRefined coating process makes the Triband RGB Ultra filters with excellent halo suppression and improved \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003esignal-to-noise performance.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eIt has been specifically designed for balanced color transmission using Antlia's experience in spectrum design.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eThe balanced transmission allows the minimal color cast to broadband emission objects such as stars, galaxies, and \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eglobular clusters.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eThe Triband RGB Ultra can be used with nearly all systems as fast as f\/2 with minimal loss of efficiency or shifts in\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003espectral response.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eWhen shooting LRGB with mono cameras, unless you are wanting to image LDN (dark nebulae) the Triband RGB Ultra \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003ecan be used as a luminance filter replacement for objects such as nebulae and galaxies to improve contrast and signal to\u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003enoise ratio.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eThe Triband RGB Ultra is able to better isolate the H-alpha, O3 and blue spectrum from the background light pollution.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eFor visual use, Triband RGB Ultra filter ensures the high transmittance of the HSO emission line and can be used for \u003c\/span\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eobserving deep-sky objects with large-diameter telescopes.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eThe filter provides excellent flexibility and compatibility with both OSC and Mono camera systems.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"text-size-adjust: 100%; font-family: Arial; font-size: 12px;\"\u003eIt facilitates the imaging of most astronomical objects using all optical configurations down to f\/2 focal ratio.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-weight: bold; font-family: Arial; font-size: 12px;\"\u003e\u003cbr style=\"text-size-adjust: 100%;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-weight: bold; font-family: Arial; font-size: 12px;\"\u003eSize Available: 2’’ mounted\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"text-size-adjust: 100%; margin: 0px; line-height: 1.5em;\"\u003e\u003cbr style=\"text-size-adjust: 100%; color: rgb(102, 102, 102); font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44013803995247,"sku":"ANT-RGB-Ultra","price":244.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Triband_252520Ultra__41067.1682636044.1280.1280.jpg?v=1766563258"},{"product_id":"askar-color-magic-duo-narrowband-6nm-d1-h-a-o-iii-imaging-filter-2-mounted","title":"Askar Color Magic Duo-Narrowband 6nm \"D1\" H-a \u0026 O-III Imaging Filter - 2\" Mounted","description":"\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eFor all astrophotography enthusiasts, filters are one of the indispensable accessories to achieve perfect deep-sky imaging. The dedicated astronomy filters for deep-sky imaging can effectively eliminate the influence from the background light and enhance the contract of your photographs and make the targets displayed more clearly and delicately. Askar’ s new-launched 6nm deep-sky Duo-narrowband Filter set colour Magic is a professional astrophotography tool specifically designed for deep-sky imaging.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThis 6nm filter set has a narrow bandwidth. Therefore, even if your are at an area affected by the urban light pollution, night glow and other undesired light, you can capture high-quality deep-sky pictures with the help of Askar 6nm Duo-narrowband Filters. The narrower bandwidth and efficient light transmission considerably enhance the contrast of your pictures, making it easier to display the details of the stars that otherwise are fairly difficult to spot.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eAt the same time, the Colour Magic 6nm deep-sky Duo-narrowband Filter has very good halation control, providing more contribution to your astrophotography.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cdiv style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cstrong style=\"outline: none; box-sizing: border-box;\"\u003eAskar 6nm Duo-narrowband Filter (OIII \u0026amp; Ha)\u003c\/strong\u003e\u003cbr style=\"outline: none; box-sizing: border-box;\"\u003e \u003cbr style=\"outline: none; box-sizing: border-box;\"\u003eAskar 6nm Duo-narrowband Filter (OIII \u0026amp; Ha) has an ultra-high transmittance over 90% at its center wavelength (500.7nm and 656.3nm). Askar 6nm Duo-narrowband Filter can effectively eliminate the influence of light pollution. Even if you are in an area seriously affected by light pollution, the pictures taken with the Askar 6nm Duo-narrowband Filter are still very good. You can get astronomical images of high quality with just one duo-narrowband filter and an ordinary astronomical colour camera.\u003cbr style=\"outline: none; box-sizing: border-box;\"\u003e \u003cbr style=\"outline: none; box-sizing: border-box;\"\u003eAskar 6nm Duo-narrowband Filter (OIII \u0026amp; Ha) is ideal for photographing emission nebulae, planetary nebulae or supernova remnants, and has a very high transmittance at the central wavelength. The highly narrow bandwidth of the filter effectively blocks out the effects of light pollution or other distracting factors such as night glow.\u003c\/span\u003e\u003c\/div\u003e\n\u003cspan style=\"font-family: Arial;\"\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: center\u003e \u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: center\u003e\u003c\/span\u003e\u003cdiv style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size:\u003e\u003cspan style=\"font-family: Arial;\"\u003e6nm Duo-narrowband Filter (OIII \u0026amp; Ha) 2”\u003cbr style=\"outline: none; box-sizing: border-box;\"\u003eFWHM: 6nm\u003cbr style=\"outline: none; box-sizing: border-box;\"\u003eCWL: 500.7nm \u0026amp; 656.3nm\u003cbr style=\"outline: none; box-sizing: border-box;\"\u003ePeak transmittance:90%\u003cbr style=\"outline: none; box-sizing: border-box;\"\u003eThickness:1.85 ± 0.05mm\u003cbr style=\"outline: none; box-sizing: border-box;\"\u003eBarrier property:=OD5 @ 200-1100nm\u003cbr style=\"outline: none; box-sizing: border-box;\"\u003eSurface finish:60\/40\u003cbr style=\"outline: none; box-sizing: border-box;\"\u003eParallelism:30”\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013854720111,"sku":"ASK-D1","price":463.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Askar_252520D1__61407.1682636061.1280.1280.jpg?v=1766564673"},{"product_id":"askar-colour-magic-6nm-d-filter-package","title":"Askar Colour Magic 6nm D Filter Package","description":"\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eFor all astrophotography enthusiasts, filters are one of the indispensable accessories to achieve perfect deep-sky imaging. The dedicated astronomy filters for deep-sky imaging can effectively eliminate the influence from the background light and enhance the contract of your photographs and make the targets displayed more clearly and delicately. Askar’ s new-launched 6nm deep-sky Duo-narrowband Filter set colour Magic is a professional astrophotography tool specifically designed for deep-sky imaging.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThis 6nm filter set has a narrow bandwidth. Therefore, even if your are at an area affected by the urban light pollution, night glow and other undesired light, you can capture high-quality deep-sky pictures with the help of Askar 6nm Duo-narrowband Filters. The narrower bandwidth and efficient light transmission considerably enhance the contrast of your pictures, making it easier to display the details of the stars that otherwise are fairly difficult to spot.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eAt the same time, the Colour Magic 6nm deep-sky Duo-narrowband Filter has very good halation control, providing more contribution to your astrophotography.\u003c\/span\u003e\u003cdiv\u003e\n\u003cdiv style=\"text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eAfter the 2\" 6nm duo-narrowband filter (Ha+OIII), Askar ColourMagic Specially launches the SII+OIII 2\" 6nm duo-narrowband filter, which is further convenient for astronomy enthusiasts while maintaining quality. When shooting with the 2\" 6nm duo-narrowband filter (Ha+OIII) and a color camera, users will have remarkable results.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eUsually in astrophotography, the Ha signal-to-noise ratio is stronger while the OIII is relatively weak. As our two duo-narrowband filters are Ha+OIII and SII+OIII, the combination can balance the signal-to-noise ratio of each channel when shooting, and after software processing, it can achieve the ideal result almost as well as shooting with a combination of three narrowband filters and mono camera.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eWe name the  Ha+OIII 2\" 6nm duo-narrowband filter “D1” and the SII+OIII filter “D2”, the combination of them is Askar's latest \"D\" filter set. It offers a new way for color camera users to get similar results without using a mono camera and the SHO filters.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cimg alt=\"\" src=\"https:\/\/www.askarlens.com\/Upload\/3_1.jpg\" style=\"outline: none; box-sizing: border-box; border: 0px; max-width: 100%; transition: all 0.3s ease 0s; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify width:\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eThe Askar D filter set offers a new option for astronomy enthusiasts and is sure to please.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cimg alt=\"\" src=\"https:\/\/www.askarlens.com\/Upload\/166684115958.jpg\" style=\"outline: none; box-sizing: border-box; border: 0px; max-width: 100%; transition: all 0.3s ease 0s; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify width:\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cimg alt=\"\" src=\"https:\/\/www.askarlens.com\/Upload\/166684105298.jpg\" style=\"outline: none; box-sizing: border-box; border: 0px; max-width: 100%; transition: all 0.3s ease 0s; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify width:\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013857800303,"sku":"Ask-D-Combo","price":906.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Askar_252520D1D2__02366.1682641095.1280.1280.jpg?v=1766564860"},{"product_id":"askar-colour-magic-6nm-deep-sky-duo-narrowband-filter-oiii-sii","title":"Askar Colour Magic 6nm Deep-sky Duo Narrowband Filter (OIII+SII)","description":"\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eFor all astrophotography enthusiasts, filters are one of the indispensable accessories to achieve perfect deep-sky imaging. The dedicated astronomy filters for deep-sky imaging can effectively eliminate the influence from the background light and enhance the contract of your photographs and make the targets displayed more clearly and delicately. Askar’ s new-launched 6nm deep-sky Duo-narrowband Filter set colour Magic is a professional astrophotography tool specifically designed for deep-sky imaging.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThis 6nm filter set has a narrow bandwidth. Therefore, even if your are at an area affected by the urban light pollution, night glow and other undesired light, you can capture high-quality deep-sky pictures with the help of Askar 6nm Duo-narrowband Filters. The narrower bandwidth and efficient light transmission considerably enhance the contrast of your pictures, making it easier to display the details of the stars that otherwise are fairly difficult to spot.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eAt the same time, the Colour Magic 6nm deep-sky Duo-narrowband Filter has very good halation control, providing more contribution to your astrophotography.\u003c\/span\u003e\u003cdiv\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cstrong style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eColour Magic 6nm Duo-narrowband Filter (OIII \u0026amp; SII)\u003c\/strong\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eWhile most of the commercially available duo-narrowband filters for deep-sky astrophotography are in the Ha and OIII bands, ASKAR offers another structure: SII \u0026amp; OIII.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e \u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eWhen shooting deep-sky galaxies with colour cameras, a duo-narrowband filter in the Ha and OIII bands is often used; whereas with a mono camera, a narrowband filter in the Ha, SII and OIII bands is often used, leaving users with colour cameras missing one band of nebula detail. This can be compensated by using SII and OIII duo-narrowband filters mentioned above.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e \u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eAskar 6nm Duo-narrowband Filter (OIII \u0026amp; SII) has an ultra-high transmittance over 90% at its center wavelength (500.7nm and 671nm). Askar 6nm Duo-narrowband Filter (OIII \u0026amp; SII) can effectively eliminate the influence of light pollution. Even if you are in an area seriously affected by light pollution, the pictures taken with the Askar 6nm Duo-narrowband Filter (OIII \u0026amp; SII) are still very good. It is so practical and efficient that you can get astronomical images of high quality with just one duo-narrowband filter and an ordinary astronomical colour camera.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e \u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eAskar 6nm Duo-narrowband Filter (OIII \u0026amp; SII) is ideal for photographing emission nebulae, planetary nebulae or supernova remnants, and has a very high transmittance at the central wavelength. The highly narrow bandwidth of the filter effectively blocks out the effects of light pollution or other distracting factors such as night glow.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e \u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e6nm Duo-narrowband Filter (OIII \u0026amp; SII) 2”\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eFWHM: 6nm\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eCWL: 500.7nm \u0026amp; 671nm\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003ePeak transmittance:90%\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eThickness:1.85 ± 0.05mm\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eBarrier property:=OD5 @ 200-1100nm\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eSurface finish:60\/40\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003eParallelism:30”\u003c\/span\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013857931375,"sku":"Ask-D2","price":463.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Askar_252520D2__21718.1682641096.1280.1280.jpg?v=1766564866"},{"product_id":"player-one-astronomy-anti-halo-pro-dual-band-2-ha-oiii-filter","title":"Player One Astronomy Anti-Halo PRO Dual-Band 2″ Ha+OIII filter","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Player One Astronomy Anti-Halo PRO Dual-Band 2″ filter isolates the two brightest emission lines in the night sky — hydrogen-alpha (Ha) at 656.3 nm and doubly ionised oxygen (OIII) at 500.7 nm — in a single 2-inch imaging filter. Its anti-halo construction suppresses the bright reflection rings that dual-band filters can throw around brilliant stars, so your emission-nebula data stays clean around the field's brightest points.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis filter is made for astrophotographers imaging emission nebulae from light-polluted skies, whether you shoot with a cooled colour (OSC) camera or a monochrome camera. If you want the Ha and OIII structure of targets like the Rosette, Veil, or North America Nebula in one exposure set while keeping stars tight and halo-free, it belongs in your imaging train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue dual-band pass:\u003c\/strong\u003e transmits Ha (656.3 nm) and OIII (500.7 nm) simultaneously, capturing the dominant red and teal nebula emissions in a single frame.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTight 3–4 nm bandwidths:\u003c\/strong\u003e a 3.7 ± 0.5 nm Ha window and a 3.2 ± 0.5 nm OIII window reject most artificial skyglow, raising contrast under heavy light pollution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-halo construction:\u003c\/strong\u003e the coating stack is engineered to eliminate the reflection halos that can surround bright stars in dual-band data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep OD5 blocking:\u003c\/strong\u003e out-of-band light is blocked to optical density 5 across 200–1100 nm, keeping the passbands clean.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh in-band transmission:\u003c\/strong\u003e ≥85% peak transmittance preserves signal at both target lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 2″ format:\u003c\/strong\u003e threads into any standard 2-inch filter cell, drawer, or filter wheel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical\/Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe filter combines two narrow passbands on one substrate: a 3.7 ± 0.5 nm FWHM window centred on the Ha line (656.3 nm) and a 3.2 ± 0.5 nm FWHM window centred on the OIII line (500.7 nm). Peak in-band transmittance is ≥85%, while everything outside the passbands is suppressed to OD5 (optical density 5) over the full 200–1100 nm range — deep enough to hold contrast against artificial light and to keep the camera's near-infrared response from leaking through. Mechanically it is a 2-inch threaded filter; the cell measures 5 mm at the body plus a 2.5 mm thread section for a 7.5 mm total stack, and the optical glass itself is 1.85 mm thick, which matters when you budget backfocus and account for the small focus shift a filter introduces.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Anti-Halo-PRO-2-inch-Dual-Band-filter-Curve-ZOOM3_8a443983-3448-4297-935a-960cbf8d1af1.png?v=1784237418\" alt=\"Player One Astronomy Anti-Halo PRO Dual-Band 2-inch Ha+OIII filter transmission curve showing the 656.3nm Ha and 500.7nm OIII passbands\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDual-band emission-nebula imaging with OSC\/colour cameras from urban and suburban skies.\u003c\/li\u003e\n\u003cli\u003eHa and OIII data collection with monochrome cameras where a combined pass speeds acquisition.\u003c\/li\u003e\n\u003cli\u003eHigh-contrast wide-field nebula work where star halos would otherwise spoil the frame.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility \u0026amp; Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit:\u003c\/strong\u003e standard 2″ (M48) filter threads — works in 2-inch filter drawers, filter wheels, and threaded nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCameras:\u003c\/strong\u003e suits both one-shot-colour and monochrome astronomy cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackfocus:\u003c\/strong\u003e the 7.5 mm cell and 1.85 mm glass add to your optical path; keep them in your spacing calculation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eThis is an imaging filter for emission nebulae; it is not intended for visual observing or for broadband targets such as galaxies and reflection nebulae.\u003c\/li\u003e\n\u003cli\u003ePlayer One does not publish a net weight for this filter, so the shipping weight shown at checkout is an estimate. Contact us if you need an exact figure.\u003c\/li\u003e\n\u003cli\u003eAs with any interference filter, introducing it shifts focus slightly, so refocus after inserting it.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e No. It threads into a standard 2-inch filter holder, drawer, or wheel and needs no power or configuration; refocus once after it is in place.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work with my one-shot-colour camera?\u003c\/strong\u003e Yes. The dual-band design lets an OSC camera record Ha and OIII together in one exposure, which is one of the main reasons to choose this filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it help under light pollution?\u003c\/strong\u003e Yes. The narrow 3.2–3.7 nm passbands and OD5 blocking reject most artificial skyglow, so it is well suited to city and suburban skies.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the “anti-halo” part?\u003c\/strong\u003e The coating stack is engineered to suppress the bright reflection rings that can appear around brilliant stars in dual-band images.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Anti-Halo PRO Dual-Band 2″ Ha+OIII filter gives you clean, halo-suppressed narrowband data on emission nebulae in a single pass, with tight 3–4 nm windows and OD5 blocking that hold contrast even under heavy light pollution.\u003c\/p\u003e","brand":"Player One Astronomy","offers":[{"title":"Default Title","offer_id":44013891125359,"sku":"AHP-HO-2","price":698.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Anti-Halo-PRO-2-inch-Dual-Band-filter__16630.png?v=1766565717"},{"product_id":"optolong-l-extreme-f2-dual-band-filter-2","title":"Optolong L-Extreme F2 Dual-Band Filter 2\"","description":"\u003cp\u003e\u003cspan\u003eTake your Hyperstar, RASA, or Rokinon F2 DSLR lens to new heights.   Designed for Fast optics vetween F2-F3.5\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong L-eXtreme F2 is a dual-band (500.7 nm and 656.28 nm, FWHM=7 nm) narrowband pass filter that meets the requirements for transmission at continuously varying angles. Astronomically characterised spectral lines (OIII, Ha) as the main transmission wavelengths, the OIII and H-Alpha nebula emission lines pass accurately at f2 - f3.3 Focal Ratio.   It's a product that Optolong has developed specifically for fast optical systems, or fast focal ratio imaging systems. It has performed well on RASA, HyperStar and other fast ratio telescopes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eKey Features:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eTogether with one-shot colour astronomical cameras, monochrome astronomical cameras, and Digital SLR cameras, you can fast and quickly obtain clear and detailed images of the deep sky;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIdeal for fast optical system, like RASA, Hyperstar and other fast focal ratio telescope users;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRecommended for using fast optical system with focal ratio from f2 to f3.3;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAnti-light pollution、better contrast、more details of the celestial bodies:This filter cuts out background light and noise beyond the target celestial bodies to get better details and contrast of the images. L-eXtreme F2 can effectively block light pollution so that the images will not affected by unwanted lights, and sky light of the background. You can quickly get satisfactory pictures in fast optical systems.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSpectrum and Characteristic\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable border=\"1\" cellspacing=\"1\" cellpadding=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSbustrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eoptical glass\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eThickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.85mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eFWHM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eOIII 7nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHa 7nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBlocking range\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e300-1000nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBlocking Depth\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u0026gt;OD4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSurface quality\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e60\/40\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTransmitted Wavefront RMS\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eλ\/4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e Parallelism\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e30s\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBased on the characteristics of celestial bodies’ emission lines and light pollution emission lines, the L-eXtreme F2 retains the prominent nebula OIII and Ha colours while blocking most of the light pollution. Specifically designed and optimally calculated for the characteristics of a fast optical system, the L-eXtreme F2 always keeps both OIII and Ha bands having high transmittance, which helps users to capture nebulae emission lines in these bands more accurately and quickly, and obtain better astrophotographic images.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/30eaf24fdaf807b26d773ea5807517e4_8f724db7-9939-4c5b-aec7-774bfbcebc9b.jpg?v=1766568055\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e※This curve is only for reference, and is not used as the final product data.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/0ff2d7f395c427aa390ff53daf333cec_254844ff-2226-4755-b350-d88a6a3e7155.jpg?v=1766568057\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/22c5068a8f4783079f93c42761aa9238_dfbb67b1-248f-4a41-855e-89298cc7132d.png?v=1766568059\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePacking\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOuter Box: silve box\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlastic Box: PP material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLining: imported high pressure white EVA material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/a853b9fa6cd8dff29d844be5e277a9e7_b1912cb3-4313-4f75-8a5a-c3f6dceb7b0d.jpg?v=1766568060\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e6. L-eXtreme F2 Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cu\u003e\u003cstrong\u003eI. Test of the new Optolong Astronomy Filter L-Extreme F2 filter ©  Tommaso Massimo Stella     \u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSadr and the Belly of the Cygnus.\u003cbr\u003eSadr is a yellow super giant star, 33,000 times more luminous than the Sun and 12 times more massive.\u003cbr\u003eIt is identified in the center of this wide-field image which portrays the center of the Northern cross (internal asterism in the constellation Cygnus). At bottom center and to the left, the Crescent nebula and the effects (cyan color, OIII) of the star Wolf-Rayet 134 can be seen.\u003cbr\u003eThe filter under test is designed to work with super fast optics centered on a focal ratio of 2. For the occasion, a full aperture Samyang 135mm f\/2 lens connected to the Omegon veTec571V4 camera was used.\u003cbr\u003eThe result is the stack of 11 exposures of 300 seconds and the processing was limited to the adjustment of the curves and a minimal stellar reduction without the use of AI tools.\u003cbr\u003eSky: SQM 19.95\u003cbr\u003eIn the first comment you can find insights into the test.\u003cbr\u003eSoon you will see published a more complete work on much weaker subjects.\u003cbr\u003eCredit: Tommaso Massimo Stella\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003ca href=\"https:\/\/www.facebook.com\/photo?fbid=10225422708688182\u0026amp;set=a.1349013078910\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f21441527c08dc44ee513c1a500446de_9d30e9da-3647-4923-ba93-d59236d79160.jpg?v=1766568062\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cu\u003e\u003cstrong\u003eII. The Bubble Nebula ©Luke Newbould \u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e52x2m exposures, RASA11, Player One Uranus-C Pro camera\u003cbr\u003eOptolong-L-Extreme f2 filter\u003cbr\u003eCaptured with NINA, \u003cbr\u003eStacked with AstroPixelProcessor, \u003cbr\u003eProcessed in PixInsight\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/21cee766946b225cc7089f5074877030_fad82a47-9b88-49ec-9c6a-eb275ca42f5d.jpg?v=1766568064\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cu\u003e\u003cstrong\u003eIII. NGC 6871, WR 134 \u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cspan\u003e\u003cu\u003e\u003cstrong\u003e©João Berbereia\u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTest with the new Filter Dual Narrowband L-eXtreme for F2 2\". The filter captures the light emitted by ionized hydrogen atoms (Hα 7nm) and doubly ionized oxygen ions (OIII 7nm) in the spectra of astronomical objects, such as nebulas.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis image was capture for a duration of 30x300 seconds, totaling 2 hours and 50 minutes. It was taken from my backyard on August 14, 2023, on Terceira Island, Azores, Portugal.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGear Info:\u003cbr\u003eCelestron C8 HD + Hyperstar V4 （f1.9） 390mm\u003cbr\u003eIoptron CEM40EC\u003cbr\u003eASI071MC -10 100gain\u003cbr\u003eOptolong L-eXtreme F2 2\"\u003cbr\u003eEAF\u003cbr\u003eASI290MM\u003cbr\u003eSky-Watcher 50ED\u003cbr\u003eASIAIR\u003cbr\u003eBortle 4 - moon3% \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/9fb69e0a83b62c3a6b297b5dc30c3dbd_91772acf-eda3-45d1-83b7-e065e4dee392.jpg?v=1766568066\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cu\u003e\u003cstrong\u003eIV.  Rosette Nebula © \u003ca href=\"https:\/\/www.facebook.com\/astronomono007\/posts\/pfbid0EjnNGx2fDHi8DYcAQhPyQ6P4RDysEF9Suc5tmAdFEae4Sd9jMrY7owZKKCFkg92sl\"\u003eAstrono Mono\u003c\/a\u003e \u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eRosette Nebula, also known as Caldwell 49, is an H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way. The open cluster NGC 2244 (Caldwell 50) is closely associated with the nebulosity, as the stars in the cluster formed from matter in the nebula.\u003cbr\u003eThe nebula has been observed to have a shape reminiscent of a human skull and is sometimes referred to as the \"Skull Nebula\". It should not be confused with NGC 246, which is also nicknamed the \"Skull Nebula\". \u003cbr\u003eTechnical data :\u003cbr\u003e45 x 300s L-eXtreme f\/2\u003cbr\u003eTakahashi Epsilon 180 ED (f2.8 focal ratio)\u003cbr\u003eZWO ASI2600MC-Pro Camera -10° ZWO ASI2600MC-Pro Camera -10° ZWO ASI2600MC-Pro Camera -10\u003cbr\u003eZWO EAF+ ZWO EFW + ZWO ASI AIR PRO\u003cbr\u003eZWO ASI 462 MC Guide Camera - Guidescope orion 80edcf\u003cbr\u003esqm 18.53 Cgem mount\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003ca href=\"https:\/\/www.facebook.com\/astronomono007\/posts\/pfbid0EjnNGx2fDHi8DYcAQhPyQ6P4RDysEF9Suc5tmAdFEae4Sd9jMrY7owZKKCFkg92sl\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/8fff0674968eaf86bc57956e4d2abb66_0b7f7200-856f-416f-b05c-e61f69882bdb.jpg?v=1766568068\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cspan\u003e\u003cstrong\u003eV. The Cygnus Loop \u003c\/strong\u003e\u003c\/span\u003e\u003c\/u\u003e\u003cspan\u003e\u003cu\u003e\u003cstrong\u003e© Georg Nyman\u003c\/strong\u003e\u003c\/u\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAstrophotographer Georg was taking images with RASA and the full frame QHY600C camera. \u003cbr\u003eThe Cygnus Loop – an object which is a very well known target of Ha and OIII. Indeed, Optolong L-eXtreme F2 performed very well and the separation of Ha and OIII is excellent – see attached result. \u003cbr\u003eThe image is a 2x1 mosaic\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCredit: Dr. Georg N. Nyman\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/32f461d9fec6c329d304c68e73346b82_874415bb-24e6-4fb7-a2af-b42ba7ee2a48.jpg?v=1766568070\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44014031011951,"sku":"LXT-2-F2","price":404.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/LXT_F2__41051.jpg?v=1766568072"},{"product_id":"optolong-l-quad-enhance-filter","title":"Optolong L-Quad Enhance Filter","description":"\u003cp\u003eL-Quad Enhance Filter (L-QEF) is a quad bandpass light pollution suppression filter for colour cameras. It effectively suppresses the transmission of light pollution wavelengths, especially light pollution generated by artificial lighting (including mercury and sodium lamps), as well as the effects of natural skylight-induced effects on the shot, thus effectively enhancing the contrast and details of the celestial bodies, and making the objects more distinct and stereoscopic. This filter provides better color balance while improving resistance of light pollution. L-QEF can be used for both wide field astrophotography, such as the Milky Way in Summer and Winter, and deep sky objects such as nebulae, galaxies, star clusters, and so forth; It allows you to save a lot of time during the shooting process and get better results at the same time. The design of quad bandpass maximises the colour balance of nebulae, galaxies and other broadband spectral targets.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCuts out light pollution from mercury and sodium lamps and produces a nice broadband image with minimal colour cast;\u003c\/li\u003e\n\u003cli\u003eSignal-to-noise ratio (SNR);\u003c\/li\u003e\n\u003cli\u003eNear IR cut-off to 1000nm, reducing the effects of IR noise;\u003c\/li\u003e\n\u003cli\u003eL-QEF has more than 90% transmittance of the nebula emission lines at H-Beta\/OIII\/H-Alpha\/SII, with cut-off depth from OD2 to OD4, thus providing a significant increase in resistance to light pollution. L-QEF is good for night sky from Bortel 1 to Bortel 7 levels; (Bortel 8, Bortel 9 environments shall not be recommended, kindly chose Optolong other narrow-band filters, 3nm, 7nm type of filters are available.);\u003c\/li\u003e\n\u003cli\u003eSuitable for wide range of deep sky targets: it covers most nebulae, galaxies, star clusters, reflected and emitted line signals astronomical objects with higher contrast and rich details while maintaining excellent colour balance. L-QEF is superior to other filters of the same type.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpectrum and Characteristic\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable border=\"1\" cellspacing=\"1\" cellpadding=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSbustrate\u003c\/td\u003e\n\u003ctd\u003eoptical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eQuad bandpass filter\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking range\u003c\/td\u003e\n\u003ctd\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003eOD2-OD4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e Parallelism\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eBased on the characteristics of celestial bodies’ emission lines and light pollution emission lines, L-Quad Enhance filter effectively reduces the impact of light pollution and suppresses the background light of astronomical objects, thus effectively enhancing the contrast and details of the celestial bodies. Using L-QEF filter can help you save a lot of time during the shooting process, yet obtaining incredible results.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/dbeae9d38c40e5c4742bd4ce3bc3eddf_9b71fce5-43d1-415d-9743-156e271388b8.jpg?v=1766568128\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp\u003e▲The vertical axis is transmission in %.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/0ff2d7f395c427aa390ff53daf333cec_25b08899-0043-4595-9a8f-2e31e029c55e.jpg?v=1766568130\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. Coating Technology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e·Multi-layers anti-reflection coating\u003c\/p\u003e\n\u003cp\u003e·Non-cementing optical substrate coating\u003c\/p\u003e\n\u003cp\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/p\u003e\n\u003cp\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePacking\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOuter Box: silve box\u003c\/p\u003e\n\u003cp\u003ePlastic Box: PP material\u003c\/p\u003e\n\u003cp\u003eLining: imported high pressure white EVA material\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/c656702f1ca52b7dc92d472bba4be081_419c1dc0-6c51-4b2b-a8c2-90f254c2b1b0.jpg?v=1766568131\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eL- Quad Enhance Filter (L-QEF) Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eI. The Seven Sisters meet the Comet ©  Vincent Cheng (China Hongkong)     \u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eThe seven sisters meet the Comet\u003cbr\u003eEquipment：\u003cbr\u003eDate \/Location :\u003cbr\u003e17-18, SEP, 2023\u003cbr\u003eDanXiaShan STARHOUSE, China（Bortle 4）\u003cbr\u003eCamea : ASI294MC Pro (cooled at 0C)\u003cbr\u003eGain : 120\u003cbr\u003eTelescope: William Optics RedCat 51 (250mm f4.9)\u003cbr\u003eFilter : Optolong L-QUAD ENHANCE 2-inch\u003cbr\u003eMount: iOptron SmartEQ PRO+\u003cbr\u003eGuide:  ASI120MM mini, ZWO OAG\u003cbr\u003econtrolled by ASIAIR plus\u003cbr\u003eExposure: 180s X 80frames\u003cbr\u003ew Dark Frames, Bias Frames, flat Frames\u003cbr\u003eprocess w PI,PS CC\u003cbr\u003eCredit: Vincent Cheng\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ab81cbde0345bb95f6e3c70c1211d265_e362d0cf-ebba-4ab6-84ee-c558219c25db.jpg?v=1766568133\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eII. Double Cluster  ©Astrodoc Ron Brecher（Canada） \u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eThis image is a test of the new Optolong L-Quad Enhance Filter (LQEF), a light pollution filter for broadband photography. This test was conducted under a full Moon and moderate transparency – a tough test for any filter. For my first target I chose the Double Cluster to evaluate star colours and shapes. This filter performed well on these targets. I will test on a galaxy when the Moon is out of the sky.\u003c\/p\u003e\n\u003cp\u003eNGC 869 (right) and NGC 884 each contain hundreds of stars and are about 13 million years old (compared to 75-150 million years for the Pleiades). Lying about 7,500 light years away and a few hundred light years apart, they have a combined mass about 6,500 times our Sun’s. However, their combined halo is more than 20,000 solar masses. The clusters are moving towards us at a speed of about 40 km\/s.\u003c\/p\u003e\n\u003cp\u003eThese open clusters are bright enough that they were originally given star designations (h- and Chi Perseus). They are visible to the naked eye, appearing as an oval foggy patch in a dark sky. They look like sparkling white diamond dust in binoculars or a small telescope. \u003cbr\u003eTekkies:\u003cbr\u003eTakahashi FS-60CB scope with flattener at f\/6.2 and QHY367C Pro one-shot colour camera with Optolong L-Quad Enhance Filter.\u003c\/p\u003e\n\u003cp\u003eAcquisition and Paramount MX control with N.I.N.A.\u003c\/p\u003e\n\u003cp\u003eNo guiding All pre-processing and processing in PixInsight.\u003c\/p\u003e\n\u003cp\u003eAcquired from my SkyShed in Guelph on September 29, 2023. Average transparency and seeing, full Moon.\u003c\/p\u003e\n\u003cp\u003e42x5m chrominance = 3hr30m\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astrodoc.ca\/double-cluster-2023\/?fbclid=IwAR2n2qjMdmpycL8QjXDuig1IPnlKXcLZ5_sv4S0YFSkFczYpk5S47q7lTtE\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/683bb9bcfc4b10f1a169f16366e7a885_55bc9db9-13be-41de-8031-0932c99bcaba.jpg?v=1766568135\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eIII. LDN 1235 Shark Nebula  ©Andrea Maggi (Italy) \u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eLDN 1235 Shark Nebula \u003cbr\u003eTesting the new Optolong filter for colour cameras\u003cbr\u003eSharpstar 76PH telescope \u003cbr\u003eCamera ZWO ASI 2600MC\u003cbr\u003eOptolong filter L-Quad Enhance Filter (L-QEF)\u003cbr\u003e11 hours of exposure\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/49deb2c530aa611105c6ecea0d48fd6c_364dbd36-e554-44fc-81ec-98bf8d0e0df0.jpg?v=1766568137\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eIV.  The globular star cluster (M92) © Tommaso Massimo Stella (Italy) \u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eThe globular star cluster (M92)\u003cbr\u003eThe performance of the filters is very good.\u003cbr\u003eDate: 2023-07-23\u003cbr\u003eLocation: Valle degli Ulivi (Taranto-Italy)\u003cbr\u003eSKY: SQM 19.85\u003cbr\u003eLights: 41x180s BIN2\u003cbr\u003eTelescope: Sky-Watcher 250\/1000 + GPU Coma Corrector\u003cbr\u003eCamera: Omegon veTEC 571C V4\u003cbr\u003eFilters: New Optolong Astronomy Filter broadband filter L-QEF\u003cbr\u003eMount: Skywatcher AZ-EQ6 GT\u003cbr\u003eProcessing: DeepSkyStacker, PixInsight, Photoshop CC\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/fe6ac906ced83059b5b7679db589b355_a4135fce-f5be-47c6-ba53-d1f2150ff070.png?v=1766568138\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eV. The Sculptor Galaxy © First Person View Astro (Frank Arapovic)  \u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eHere is my latest edit of NGC253 also goes by the name of The Sculptor Galaxy or by the name The Silver Dollar Galaxy. It is estimated to be about 45,000 light years across and 11.4 million light years away from Earth.\u003c\/p\u003e\n\u003cp\u003eThis image was taken with the new Optolong Filter User L-Quad Enhance Filter. This filter is excellent. The first thing you notice and really stands out after you open up the package is the build quality of the filter, it is second to none. You can see that the manufacturing and QC process has been to the highest standard.\u003c\/p\u003e\n\u003cp\u003eBut as you can see in the image it's the results that truly matters and I have found that this filter is capable of doing what it states, providing excellent image quality in light polluted areas.\u003c\/p\u003e\n\u003cp\u003eProcessing the image was easy too. There are no halos around bright stars thus far. I have imaged other targets but with only a limited amount of subs, such as M17 and NGC2070, however with the limited time I have had on those targets it's shown to be promising.\u003c\/p\u003e\n\u003cp\u003eI am yet to image some more difficult targets such as The Orion Nebula but I am keen to do so ASAP.\u003c\/p\u003e\n\u003cp\u003eThe image was taken in a bortle 5 location with the moon out over two nights of the 4th and 5th of October 2023\u003c\/p\u003e\n\u003cp\u003eCelestron EdgeHD8 at f7\u003cbr\u003eZWO ASI2600MC Pro, gain 101, -10c\u003cbr\u003e154 x 180sec subs, cropped\u003cbr\u003e30 x darks\u003cbr\u003e30 x flats\u003cbr\u003e30 x flat darks\u003cbr\u003eStacked and Processed with PixInsight\u003c\/p\u003e\n\u003cp\u003eBortle 5, backyard Auckland, New Zealand\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ace6fa6a8881a5d85e9f87e9db1d1c3b_b00f62d8-cb8b-4305-9d63-0cbb8d33f2ea.png?v=1766568140\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eVI. NGC7000 and the Pelican Nebula  © Shawn Nielsen (Canada)\u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eNGC 7000 (left) and the Pelican Nebula (right) imaged with the new Optolong Quad enhance filter for OSC. \u003cbr\u003eAlso used, Starfield 60Q telescope, QHY268C camera and iOptron HEM15 strainwave mount. \u003cbr\u003e5hr 30min total. \u003cbr\u003eImaged under 80% Moon.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/836ffc71f86d80815dc32789f9f5844a_3b0ebed0-2abc-4fd8-a18c-2fafed3ce5d0.jpg?v=1766568142\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eVII. Shark nebula (LDN1235) © Matej Mihelčič （Slovenia） \u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eShark nebula (LDN1235)\u003cbr\u003eOmegon 108Q@600m \u003cbr\u003eASI094MC\u003cbr\u003eOptolong L-Quad Enhance Filter (L-QEF) \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/974bcc3bbe7d4033d39b8a142085e4ae_c3577fbf-e55d-4b6a-85b0-2697abfab55a.png?v=1766568144\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44014033567855,"sku":"L-QEF","price":260.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/L-Quad__13258.jpg?v=1766568146"},{"product_id":"sightron-quad-bp-iii-filter","title":"Sightron Quad BP III Filter","description":"\u003cp\u003e\u003cspan\u003eSightron Japan Quad Band-Pass III 2\" \/ 48 mm filter. Nebular filter for astrophotography with bandpass centered on the main nebular emissions (H-Beta, OIII, H-Alpha, SII). High quality filter made in Japan.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFused quartz substrate with a high transmission index even in ultraviolet light, free of contamination and highly resistant to heat.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGlass thickness : 1.5mm\u003c\/li\u003e\n\u003cli\u003eGlass type : Fused Quartz – excellent purity and transmission including UV. Extremely low contamination. High heat resistance.\u003c\/li\u003e\n\u003cli\u003eM48 (for 2″) and M28.57mm\/0.53mm pitch (for 1.25″) mounted\u003c\/li\u003e\n\u003cli\u003eMade in Japan\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/qbpf_g_c6df8aaf-1f56-406f-a038-bb39f1997302.jpg?v=1766569811\"\u003e\u003c\/p\u003e","brand":"Sightron Japan","offers":[{"title":"Default Title","offer_id":44014076821615,"sku":"SJ-QBPIII-48","price":254.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/QBP1000__35170.jpg?v=1766569813"},{"product_id":"antlia-quad-band-anti-light-pollution-filter-2","title":"Antlia Quad Band Anti-Light Pollution Filter 2\"","description":"\u003cp\u003eThe Antlia Quad Band Anti-Light Pollution Filter is a light suppression filter for color and monochrome cameras. It is able to shoot most deep sky objects like galaxies, reflection nebulae, emission nebula, and star clusters from a Bortle 8 location to Bortle 1 as its spectral transmission passes through visible light region, near-ultraviolet (NUV) and near-infrared (NIR) region.\u003c\/p\u003e\n\u003cp\u003eAntlia Quad Band filter has a broad bandpass designed to cope with faster optics up to the f\/2 focal ratio.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eConsidering the high quantum efficiency (QE) characteristics of the latest cameras in the near-infrared region and this region is less susceptible to artificial light pollution, the Antlia Quad Band Light-Pollution Filter adds high transmission in the near-infrared (NIR) band. This spectrum design improves image signal-to-noise ratio and contrast by capturing signals in visible bands and NIR region, while also maintaining ood color balance and being easier to manage in post-processing.\u003c\/p\u003e\n\u003cp\u003eCertain full-spectrum objects like M51, M83 possess significant signal in the near-infrared (NIR) region, you can possibly capture these deep sky objects more contrasted with the Antlia Quad Band filter under light polluted condition.\u003c\/p\u003e\n\u003cp\u003eWhen using this filter with a camera that has UV\/IR cut protective glass, the visible band transmission signal is retained, but the IR cut limits your ability to capture targets with infrared signal.\u003c\/p\u003e\n\u003cp\u003eTherefore, the Antlia Quad Band filter is more suitable for cameras with AR protective glass as they can capture both NIR and visible band signals.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cstrong\u003e\u003cspan\u003eSpectrum\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003cspan\u003e Specifications:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable border=\"0\" width=\"580\" cellspacing=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\"\u003e \u003c\/td\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eH-alpha\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"100\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eS-II\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"107\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eO-III\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"103\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eH-beta\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNII\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eWavelength\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e656.3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"100\"\u003e\n\u003cp\u003e\u003cspan\u003e671.6nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e672.4nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"107\"\u003e\n\u003cp\u003e\u003cspan\u003e495.9nm,\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e500.7nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"103\"\u003e\n\u003cp\u003e\u003cspan\u003e486.1nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e658.3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e654.8nm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003ePeak Transmission\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e＞92%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"100\"\u003e\n\u003cp\u003e\u003cspan\u003e＞92%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"107\"\u003e\n\u003cp\u003e\u003cspan\u003e＞92%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"103\"\u003e\n\u003cp\u003e\u003cspan\u003e＞92%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003e92%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eBlocking\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"5\" valign=\"center\" width=\"534\"\u003e\n\u003cp\u003e\u003cspan\u003e≥OD4@ 300-1\u003c\/span\u003e\u003cspan\u003e050\u003c\/span\u003e\u003cspan\u003enm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\"\u003e\n\u003cp\u003e\u003cspan\u003eFilter Thickness\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"5\" valign=\"center\" width=\"534\"\u003e\n\u003cp\u003e\u003cspan\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSpectrum Curve:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e\u003cimg class=\"need_fix\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ABUIABACGAAg5LTqrwYop7Dg2gQwqwk4-AU_08aa0d61-78a8-4df2-b66e-36d70491b152.jpg?v=1766570201\" alt=\"Antlia Quad Band filter spectrum curve.jpg\" width=\"1193\" height=\"762\"\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe main features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e- Anti-Light Pollution\u003c\/p\u003e\n\u003cp\u003eThe Antlia Quad Band filter is an effective solution for reducing light pollution, as it cuts out most of the orange-yellow lights from 589nm and part of blue lights from LEDs\u003c\/p\u003e\n\u003cp\u003e- Possible to shoot over 95% of deep sky objects\u003c\/p\u003e\n\u003cp\u003e- Unique spectral design offers more possibilities for astrophotography\u003c\/p\u003e\n\u003cp\u003e- High transmittance of the main emission lines Ha\/SII\/OIII\/H-Beta in the visible region, enhances the astrophotography's high SNR and contrast;\u003c\/p\u003e\n\u003cp\u003e- Near-infrared (NIR) region transmittance\u003c\/p\u003e\n\u003cp\u003e- Passing near infrared region is for shooting deep sky objects that cannot be shot with other filters without NIR transmission\u003c\/p\u003e\n\u003cp\u003e- The broad bandpass designed to cope with faster optics up to the f\/2 focal ratio.\u003c\/p\u003e\n\u003cp\u003e- Good color balance\u003c\/p\u003e\n\u003cp\u003e- It is easier to achieve color balance by adding the short-wavelength transmission\u003c\/p\u003e\n\u003cp\u003e- Superior optical reliability reduces post image processing\u003c\/p\u003e\n\u003cp\u003e- Basic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003e- Surface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e- Transmitted Wavefront: Lambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003e- Parallelism: less than 30 arcsec\u003c\/p\u003e\n\u003cp\u003e- Warranty: 3-years against delamination\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSizes\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003cspan\u003eand MAP Prices\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003cspan\u003e：\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable border=\"0\" width=\"666\" cellspacing=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"150\"\u003e\n\u003cp\u003e\u003cspan\u003eSize\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"516\"\u003e\n\u003cp\u003e\u003cspan\u003eMinimum Advertised Pricing (MAP)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"150\"\u003e\n\u003cp\u003e\u003cspan\u003eMounted: 2’’\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"516\"\u003e\n\u003cp\u003e\u003cspan\u003eUS$\u003c\/span\u003e\u003cspan\u003e198\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"150\"\u003e\n\u003cp\u003e\u003cspan\u003eOther sizes\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"516\"\u003e\n\u003cp\u003e\u003cspan\u003eAvailability is to be confirmed\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Ring:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia standard ring:1.25’’ (M28.5*0.6)，2’’(M48*0.75)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBlack Anodized Finish\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLaser Engraving No Fading\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNot Recommended:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSolar imaging\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNight visual observation\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNot Permitted:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia Filters","offers":[{"title":"Default Title","offer_id":44014081409135,"sku":"ANT-QUAD","price":267.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ANT-Quad__34911.jpg?v=1766570203"},{"product_id":"askar-c1-duo-band-ha-oiii-filter","title":"Askar C1 Duo-band Ha+OIII filter","description":"\u003cp\u003e\u003cspan\u003eColour Magic C1 Duo-band filter (Hα+OIII) has a high transmittance of over 90% at its center wavelength (500.7nm and 656.6nm). It can effectively improve the quality of the image by making the sky background of the image darker while maximizing the contrast throughout the image， enhancing the contrast of your pictures, and making it easier to display the details of the stars. In areas with very serious light pollution, this filter can also selectively filter light pollution and cluttered signals through the emission lights of the nebula to achieve the ideal shooting effect.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv id=\"saf-detail-1\" class=\"cbox-15 p_loopItem\"\u003e\n\u003ch3 class=\"e_h3-18 s_summary\"\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"e_richText-17 s_title clearfix\"\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003eC1 Duo-band Filter (OIII \u0026amp; Ha) 2”\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e OIII：35nm±5nm\/Ha：15nm±3nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eCWL\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e500.7nm \u0026amp; 656.6nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003ePeak transmittance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e90%\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e2 ± 0.05mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eBarrier property\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003eOD3 @ 200-1000nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eSurface finish\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003eC Filters VS D Filters\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cimg id=\"1744242701691588608\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460240318\/cms\/image\/d9fc62ca-200d-4a8d-97da-271704275a65.jpg\" alt=\"长友气体\"\u003e\u003c\/p\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003eC Transmittance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg id=\"1737360492640669696\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460240318\/cms\/image\/ee17a63e-9952-4318-948b-5c899d9a6cb1.jpg\" alt=\"长友气体\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"saf-detail-2\" class=\"cbox-15 p_loopItem\"\u003e\n\u003ch3 class=\"e_h3-18 s_summary\"\u003eVideo\u003c\/h3\u003e\n\u003cdiv class=\"e_richText-17 s_title clearfix\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"saf-detail-3\" class=\"cbox-15 p_loopItem\"\u003e\n\u003ch3 class=\"e_h3-18 s_summary\"\u003eImages\u003c\/h3\u003e\n\u003cdiv class=\"e_richText-17 s_title clearfix response-transition\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cimg id=\"1737361294995132416\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460166674\/cms\/image\/7793cf4b-19ea-4534-8384-94312e50ffa8.jpg\" alt=\"长友气体\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eIC 1848 Soul Nebula(HOO)  |  ASKAR 103APO+0.6x Full-frame Reducer+ASI 2600MC Pro  |  Colour Magic C1 Duo-band Filter (Hα+OIII)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44014116307055,"sku":"Colourmagic-C1","price":169.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Askar_C1__52135.png?v=1766571845"},{"product_id":"colour-magic-c2-duo-band-filter-sii-oiii","title":"Colour Magic C2 Duo-band Filter (SII+OIII)","description":"\u003cp\u003e\u003cspan\u003eColour Magic C 2\" Duo-band filter is a professional astrophotography tool specifically designed for deep-sky imaging. The Colour Magic C2 duo-band filter is SII+OIII filter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv id=\"ie_text-1703049718429\" class=\"reset_style\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eWhen shooting deep-sky galaxies with color cameras, a duo-band filter in the Hα +OⅢ bands is often used; whereas with a mono camera, a narrowband filter in the Hα, SⅡ, and OⅢ bands is often used, leaving users with color cameras missing one band of nebula detail. This can be compensated by using the Colour Magic C Duo-band filter (SⅡ+OIII) mentioned above.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"ie_text-1703049761038\" class=\"reset_style\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eColour Magic C2 Duo-band filter (SII+OIII) has a high transmittance of over 90% at its center wavelength (500.7nm and 672nm). It can effectively improve the quality of the image by making the sky background of the image darker while maximizing the contrast throughout the image， enhancing the contrast of your pictures, and making it easier to display the details of the stars. In areas with very serious light pollution, this filter can also selectively filter light pollution and cluttered signals through the emission lights of the nebula to achieve the ideal shooting effect.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv id=\"saf-detail-1\" class=\"cbox-15 p_loopItem\"\u003e\n\u003ch3 class=\"e_h3-18 s_summary\"\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"e_richText-17 s_title clearfix\"\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003eC2 Duo-band Filter (OIII \u0026amp; SⅡ) 2”\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e OIII：35nm±5nm\/SⅡ：15nm±3nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eCWL\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e500.7nm \u0026amp; 672nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003ePeak transmittance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e90%\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e2 ± 0.05mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eBarrier property\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003eOD3 @ 200-1000nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eSurface finish\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003eC Filters VS D Filters\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cimg id=\"1744242701691588608\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460240318\/cms\/image\/d9fc62ca-200d-4a8d-97da-271704275a65.jpg\" alt=\"长友气体\"\u003e\u003c\/p\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003eC Transmittance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg id=\"1737360492925882368\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460240318\/cms\/image\/323c00e7-5b5e-4cd0-aa35-63b46d222edc.jpg\" alt=\"长友气体\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"saf-detail-2\" class=\"cbox-15 p_loopItem\"\u003e\n\u003ch3 class=\"e_h3-18 s_summary\"\u003eVideo\u003c\/h3\u003e\n\u003cdiv class=\"e_richText-17 s_title clearfix\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"saf-detail-3\" class=\"cbox-15 p_loopItem\"\u003e\n\u003ch3 class=\"e_h3-18 s_summary\"\u003eImages\u003c\/h3\u003e\n\u003cdiv class=\"e_richText-17 s_title clearfix response-transition\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cimg id=\"1737361320663388160\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460166674\/cms\/image\/b2dd3440-07a9-4ff9-8aa9-47dc53dfa253.jpg\" alt=\"长友气体\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eIC 1848 Soul Nebula(SOO)  |  ASKAR 103APO+0.6x Full-frame Reducer+ASI 2600MC Pro  |  Colour Magic C2 Duo-band Filter (SII+OIII)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44014116470895,"sku":"Colourmagic-C2","price":169.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Askar_C2__16649.png?v=1766571859"},{"product_id":"lsynergy","title":"Optolong L-Synergy dual-narrow band filter FWHM7nm","description":"\u003cp\u003e\u003cspan\u003eOptolong L-Synergy‌ is a dual 7nm narrowband filter compatible with DSLR cameras, color CMOS sensors, and CCD cameras, supporting telescope systems with F-ratio of F3.3 or above (slower system）. Its key advantage lies in enabling astrophotography amateurs to capture exceptionally detailed emission nebulae even in light-polluted environments. it has been optimized to minimize bright star halos while isolating all emission lines except SII and OIII, achieving maximum effective transmission.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eWhy do we make a L-Synergy filter?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe core innovation of L-Synergy filters lies not in a single functional breakthrough, but rather in the precise combination of traditional dual-narrowband (Ha \u0026amp; OIII) technology—specifically tailored for color camera users. By adopting a dual-filter setup of ‌\"Ha \u0026amp; OIII + SII \u0026amp; OIII\"‌, it overcomes the inherent limitations of color cameras in narrowband astrophotography. With L-Synergy, users can achieve ‌Hubble Palette-style deep-sky images‌ comparable to those captured by monochrome SHO (SII\/Ha\/OIII) systems—‌without switching to a monochrome camera or purchasing additional SHO filters‌.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis solution delivers ‌high-quality results with minimal investment‌, making professional-level narrowband imaging accessible to all.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eOptolong L-Synergy \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eO‌potlong L-Synergy‌ is a dual 7nm narrowband filter compatible with DSLR cameras, color CMOS sensors, and CCD cameras, supporting telescope systems with F-ratio of F3.3 or above (slower system）. Its key advantage lies in enabling astrophotography amateurs to capture exceptionally detailed emission nebulae even in light-polluted environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAfter years of technical refinement, it has been optimized to minimize bright star halos while isolating all emission lines except SII and OIII, achieving maximum effective transmission.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong L-Synergy's advantage lies in its selective transmission of only the nebula emission lines OIII (500.7nm) and SII (672.4nm), while blocking all other light-polluting emission lines. This ensures that only the signals from oxygen and sulfur elements are captured during imaging, resulting in a darker sky background and significantly enhanced contrast and signal-to-noise ratio (SNR) between nebulae.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEven in heavily light-polluted areas, this filter selectively transmits nebula emission lines while filtering out light pollution, ultimately eliminating its impact on astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBy analyzing the spectral characteristics of both celestial emission lines and light pollution, L-Synergy selectively preserves the SII and OIII nebula colors while filtering out the majority of light pollution. Specifically designed and optically optimized, L-Synergy maintains consistently high transmission across both SII and OIII bands. This ensures users can precisely capture the target nebula emissions, delivering optimal astrophotography results.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2b383de22cb607feeca255a89118e02d_c59c14ec-2573-47b1-ad25-aff9ee7c5803.png?v=1766572845\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e*We will continue to optimize the product based on test results. This curve does not represent final product specifications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/0ff2d7f395c427aa390ff53daf333cec_d028d364-9008-450c-8d4c-49a24a348703.jpg?v=1766572846\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eL-Synergy Filter Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eI. WR134 in the Cygnus constellation © Gianni Lacroce\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTest with the new Optolong L-sinergy filter, a 7nm S2 O3 dual-band filter, and \u003cu\u003eI have to say I really liked it.\u003c\/u\u003e\u003cbr\u003eI chose to photograph WR134 in the constellation Cygnus.\u003cbr\u003eHaving shot in monochrome, which usually results in a significant amount of signal with an H-alpha filter, the O3 is there, but sometimes I have to integrate a lot to bring it out; the S2 isn't there at all. So I thought, ‘There won't be all that much signal; to take a decent photo, I'll have to integrate a lot,’ and that's why I took 200 5-minute shots.\u003cbr\u003eOnce I'd processed the photo, I found it came out of the WBPP \u003cu\u003ewithout gradients or halos\u003c\/u\u003e, but above all, bicolour, meaning full of S2 and lots and lots of O3, and I find this wonderful. I didn't have to do anything else in processing except stretch the image, balance contrast, highlights, and tones to customise it a bit, but in the end, it was already like this in the raw file.\u003cbr\u003e\u003cu\u003eThis filter greatly simplifies post-production.\u003c\/u\u003e\u003cbr\u003eI'll also show you the Starless Nebula to help you understand the signal and the O3 it produces.\u003cbr\u003eMore shots of this new filter will follow soon.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eEQUIPMENT\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eImaging Telescope: Newton Tecnosky Carbon 200\u003cbr\u003eImaing CameraZwo Asi 2600 duo  \u003cbr\u003eMount: Zwo Am5\u003cbr\u003eOptolong \u003cu\u003e\u003cstrong\u003eL-Synergy\u003c\/strong\u003e\u003c\/u\u003e filters\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003ePHOTOS\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003etemp 0 with dark, flat and darkflat\u003cbr\u003e200 x 300s  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePROCESSING\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePixinsight\u003cbr\u003ePhotoshop\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/3dc76bfb5842d4edd3a1bc3b42921500_6f36e30d-4f55-4c89-97c5-13015b330cb5.jpg?v=1766572848\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/e0ca57831dd087abad04f33706aad8e5_81e438a0-87a4-4e8c-82f2-315eedd0df6c.jpg?v=1766572850\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44014143996015,"sku":"L-Synergy","price":389.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/L-Syn__10465.jpg?v=1766572852"},{"product_id":"optolong-l2-dual-combo-set-l-extreme-l-synergy","title":"Optolong L2 Dual-Combo Set (L-eXtreme\u0026L-Synergy)","description":"\u003cp\u003e\u003cspan\u003eL2 Dual-Combo Set includes two premium filters: one L-eXtreme and one L-Synergy.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eL-eXtreme:The L-eXtreme is a dual-narrowband filter (OIII-7nm \u0026amp; Ha-7nm) designed to exclusively transmit the key nebula emission lines of OIII (500.7nm) and Hα (656.3nm). By effectively blocking all other light pollution emission lines, it ensures that only the signals from OIII and Hα elements are captured during imaging, achieving maximum effective transmission. With years of technological refinement, it significantly optimizes the performance in suppressing bright star halos.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eL-Synergy：The L-Synergy is a dual-narrowband filter (OIII-7nm \u0026amp; SII-7nm) that guarantees high transmission for both the SII (672.4nm) and OIII (500.7nm) spectral lines, while offering exceptional out-of-band rejection for all other wavelengths. By effectively blocking all other light pollution emission lines, it ensures that only the signals from OIII and SII elements are captured during imaging, achieving maximum effective transmission. With years of technological refinement, it significantly optimizes the performance in suppressing bright star halos.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eWhy is L2 Dual-Combo Set?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe L2 Dual-Combo Set is engineered to unleash the power of Hubble Palette imaging for color camera users, supporting telescope systems as fast as F3.3, and above ( slower system).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTailored specifically for color camera astrophotographers, this set includes two premium filters: OIII \u0026amp; Hα (L-eXtreme),OIII \u0026amp; SII (L-Synergy).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis innovative combination breaks through the traditional limitations of narrowband imaging with color cameras. Without the need to switch to a monochrome camera or invest in an expensive SHO three-filter set, users can achieve stunning Hubble Palette images at a fraction of the cost and complexity.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe core appeal of this combination design lies in lowering barriers and expanding possibilities for colour camera users: it preserves the equipment advantages of colour cameras while enabling users to unlock “Hubble-like” creative capabilities at minimal cost through minimalist filter combination. Simultaneously, it offers greater flexibility for astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhether capturing nebular detail or reproducing deep-sky colours, this combination enables richer creative expression, truly unlocking the full potential of colour cameras in deep-sky photography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBased on the characteristics of celestial emission lines and light pollution emission lines, the L2 Dual-Combo Set preserves the distinctive colours of nebulae in OIII, Hα, and SII while filtering out the vast majority of light pollution. Specifically designed and optically optimized, its transmission profile is as follows:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/19ce3d5664886f96373832d4be8e8830_0428b318-c584-448d-bc0e-6f4791225145.png?v=1766572864\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e*We will continue to optimize the product based on test results. This curve does not represent final product specifications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/0ff2d7f395c427aa390ff53daf333cec_845a4388-a28a-4d44-9b94-d842f2094bca.jpg?v=1766572865\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eL2 Dual-Combo Set Packing Style\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOuter Box: Gift set packing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlastic Box: PP material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLining: imported high pressure BLACK EVA material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/b2fda500625ec7b632079fa3facd585b_ba756d4a-6de7-4d80-b96a-346a196e52c6.jpg?v=1766572867\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e6. L2 Dual-Combo Set Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eI. \u003c\/strong\u003e\u003cstrong\u003eNGC 7000 in SHO\u003c\/strong\u003e\u003cstrong\u003e©RONALD BRECHER\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNGC 7000 (also called the North America Nebula) dominates the left side of this image, and NGC 5070 (the Pelican Nebula) is to the right. These clouds of gas are part of a huge complex of emission nebulae lying about 1,600 light years away in northern Cygnus. With an apparent magnitude (brightness) of 4, in theory this object is visible to the naked eye, even though its light is very spread out. I have seen it with my naked eye and with low power binoculars in dark skies north of where I live. It looks like a faintly hazy, irregular patch of grey.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eI have previously imaged this region in a wide field and at higher resolution. For example, you can find images of the \u003ca href=\"https:\/\/astrodoc.ca\/southern-ngc7000-the-cygnus-wall\/\"\u003eCygnus Wall \u003c\/a\u003e(the “Central America” region) and \u003ca href=\"https:\/\/astrodoc.ca\/ic5070-and-ic5067-the-pelican-nebula\/\"\u003ethe Pelican\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll but one of my prior images has been in natural broadband colour, dominated by red emissions of hydrogen. For this image I used two Optolong dual-narrowband filters designed for colour cameras. The Optolong L-eXtreme passes hydrogen and oxygen emissions; the brand-new L-Synergy filter passes sulphur and oxygen emissions. I combined the data from the two filters assigning sulphur to red, hydrogen to green, and oxygen to blue, making the traditional Hubble Palette. As you can see from the image, the filters worked great. It will be available for purchase soon. This is the first narrowband image made with the 70mm f\/7 Sky-Watcher Esprit EDX refractor. Sky-Watcher hopes to have them available to buy by the end of 2025. Here is some preliminary information about the new Esprit EDX line.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003ca href=\"https:\/\/astrodoc.ca\/ngc-7000-sho\/\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/eb5a201a5a2700e7b4e509292cffabd9_e1f9820c-c155-4d9b-b939-8beca563c533.jpg?v=1766572869\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTekkies\u003c\/strong\u003e:\u003cbr\u003eAcquisition, focusing, and control of Paramount MX mount and other equipment with N.I.N.A. and TheSkyX. Unguided. Focus with Primalucelab Sesto Senso 2 on the Sky-Watcher stock focuser. Equipment control with Primalucelab Eagle 4 Pro computer. All pre-processing and processing in PixInsight. Acquired from my SkyShed in Guelph. Acquired under average transparency and seeing and moderate to strong moonlight from August 31 – September 8, 2025.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSky-Watcher Esprit 70 EDX refractor, QHY367C Pro camera.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eL-Synergy Filter: 147 x 5m = 11hr 50m\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eL-eXtreme Filter: 140 x 5m = 11hr 40m\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTotal: 23hr 30m\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eData Reduction and Linear Processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePreprocessing: The WeightedBatchPreProcessing script was used to perform calibration, cosmetic correction, weighting, registration, local normalization, integration and Drizzle integration of all frames (Fast Drizzle, Scale=2x, Drop Shrink=0.9).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGradient Removal: DynamicBackgroundExtraction was applied to the two masters (L-Synergy = SOO; L-eXtreme = HOO).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSHO Master Creation: PixelMath was used to create an SHO using the equations:\u003cbr\u003eR=SOO[0]\u003cbr\u003eG=HOO[0]\u003cbr\u003eB=0.25 x (SOO[1] + SOO[2]+HOO[1] + HOO[2]\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDeconvolution: BlurXterminator was applied to the SHO image using an automatic PSF, star sharpening set to 0.10, and “Correct First” selected.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBy \u003ca title=\"Posts by Ron Brecher\" href=\"https:\/\/astrodoc.ca\/author\/astrodoc\/\"\u003eRon Brecher\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44014144389231,"sku":"O-L2-Dual Combo","price":719.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/L2_combo__37454.jpg?v=1766572871"},{"product_id":"optolong-l-extreme-nikon-z-full-frame-clip-in-filter","title":"Optolong L-eXtreme Nikon Z Full Frame ILDC Clip-in Filter","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Optolong L-eXtreme Nikon Z Full Frame ILDC Clip-in Filter is a dual-narrowband emission-line filter from Optolong Optics that installs directly in the throat of full-frame Nikon Z-series mirrorless bodies. It passes only two 7nm windows — centred on H-alpha (656nm) and OIII (496\/500nm) — and blocks the rest of the 300–1000nm range with light-pollution line blocking greater than 99%. Peak transmission is above 90%. Because there is no transmission between the H-beta and OIII lines, where nebulae do not emit, the sky background stays dark while emission-nebula signal stays strong, even under city skies or moonlight.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you image emission nebulae with a one-shot-colour full-frame Nikon Z camera from a light-polluted location, or want to keep imaging when the Moon is up. It suits fast lenses and telescopes and one-shot-colour deep-sky work on Ha\/OIII targets such as the Orion, Rosette, Heart and North America nebulae. It is an imaging filter, not a broadband or visual filter — for galaxies, clusters and reflection nebulae, use the L-Pro instead.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual 7nm narrowband:\u003c\/strong\u003e isolates H-alpha and OIII to maximise nebula contrast and signal-to-noise ratio.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep out-of-band blocking:\u003c\/strong\u003e 300–1000nm rejection with line blocking greater than 99% keeps the background dark under heavy light pollution and moonlight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimised for fast optics:\u003c\/strong\u003e the passband is set to hold up with one-shot-colour cameras and fast focal ratios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-frame clip-in fit:\u003c\/strong\u003e seats in the Nikon Z throat ahead of the sensor and works behind any compatible lens with no threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging-grade optics:\u003c\/strong\u003e B270 substrate, 1.85mm thick, λ\/4 transmitted wavefront, 60\/40 surface quality and 30-arcsec parallelism for tight stars.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eOptical Design \u0026amp; Coatings\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe L-eXtreme is a multi-layer interference filter built on a 1.85mm B270 substrate. Its two 7nm passbands are formed by stacked dielectric coatings applied with ion-assisted deposition, which is what allows such narrow bands to hold a stable central wavelength without drifting with temperature. The narrow bandwidth is deliberately matched to the H-alpha and OIII emission lines so that broadband light pollution — spread across the whole spectrum — is almost entirely rejected while the two nebula lines pass at high transmission. As with any interference filter, transmission is angle-dependent: performance is specified for roughly 50mm focal length and longer, and very fast cones or wide lenses can broaden and shift the effective band. The transmission curve below shows the two narrow passbands against the otherwise deep blocking.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/optolong-l-extreme-nikon-z-transmission-chart.png?v=1783183694\" alt=\"Optolong L-eXtreme Nikon Z clip-in filter transmission spectrum chart showing dual 7nm narrowband Ha and OIII passbands\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOne-shot-colour imaging of emission nebulae (Ha\/OIII) from light-polluted skies\u003c\/li\u003e\n\u003cli\u003eDeep-sky imaging through bright-moon periods\u003c\/li\u003e\n\u003cli\u003eFast-system widefield and telescope astrophotography of HII regions\u003c\/li\u003e\n\u003cli\u003eBicolour \/ narrowband-style processing from a single OSC camera\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera bodies:\u003c\/strong\u003e Nikon Z5, Z6, Z6II, Z7, Z7II, Z8, Z9 and ZF (full-frame Z mount).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLenses:\u003c\/strong\u003e all Z-series lenses; all F-series main and auxiliary lenses via the appropriate mount adapter\/connector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal length:\u003c\/strong\u003e intended for use at 50mm and above; wider lenses may show an interference edge that can be cropped out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocus and compose:\u003c\/strong\u003e the clip sits in front of the sensor, so use Live View.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eImportant Limitations\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNot a solar filter — never use it to view or image the Sun.\u003c\/li\u003e\n\u003cli\u003eNarrowband only — not for broadband targets; galaxies, clusters and reflection nebulae are better served by the L-Pro.\u003c\/li\u003e\n\u003cli\u003eDesigned for astrophotography rather than general visual observing.\u003c\/li\u003e\n\u003cli\u003eFull-frame Z mount only; not for APS-C\/DX or other mounts.\u003c\/li\u003e\n\u003cli\u003eBelow ~50mm the interference edge may need cropping.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this good for beginners?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is best once you are comfortable with deep-sky capture and processing. If you are shooting broadband Milky Way scenes, the L-Pro is the easier starting point.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eImaging emission nebulae (H-alpha and OIII) from light-polluted skies or under moonlight with a one-shot-colour camera.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it for visual or astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAstrophotography. The narrow dual-band design is optimised for imaging, not general visual use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich cameras does it fit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFull-frame Nikon Z bodies: Z5, Z6, Z6II, Z7, Z7II, Z8, Z9 and ZF.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is it different from the L-Pro?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe L-eXtreme is dual-narrowband (Ha\/OIII) for emission nebulae in heavy light pollution. The L-Pro is broadband for galaxies, clusters and Milky Way work with natural colour.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a dual-narrowband 7nm Ha\/OIII clip-in filter for full-frame Nikon Z cameras that pulls emission nebulae out of light-polluted or moonlit skies. Use it at 50mm and up with a one-shot-colour camera, and switch to the L-Pro for broadband targets.\u003c\/p\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":53546071294063,"sku":"OPT-LEXT-NKZ-FF","price":327.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/3bc5b5663ee879da7a48733408704256_31333984-9c05-4b01-99cb-fa4a986b8be8.jpg?v=1783176173"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/collections\/apivperw9__00702.jpg?v=1767588316","url":"https:\/\/ontariotelescope.com\/collections\/dual-band.oembed?page=2","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}