{"title":"Optolong Visual \u0026 Planetary Filters","description":"\u003cp\u003eOptolong visual \u0026amp; planetary filters. Part of \u003ca href=\"\/collections\/optolong\"\u003eOptolong\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"optolong-variable-polarizer-filter-1-25","title":"Optolong Variable Polarizer Filter - 1.25\"","description":"\u003cdiv\u003e\u003cspan style=\"font-weight: bold; font-family: Arial;\"\u003eOptolong Variable Polarizing Filter - 1.25”\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eAdjust the brightness level of the Moon, Venus, and other bright objects with the Optolong Variable Polarizer. A standard Moon Filter is similar to a pair of sunglasses. They work fine, but sometimes the scene is too dark or too bright, and there’s not a lot you can do about it. A variable polarizing filter is much more flexible than a Moon filter. It allows you to set the percentage of attenuation by turning the top section of the two-piece filter. Simply attach the 1.25” threaded filter to a like-sized eyepiece or astro accessory barrel, and then slowly rotate the top half of the filter—it turns 360°—to achieve the results you desire. Now you can apply more filtering to a full moon and less to a beautiful crescent—it’s your call!\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;\"\u003eThe Optolong 1.25” Variable Polarizing Filter also works great to cut brightness when you are using your telescope for terrestrial observations or photography. If you have ever done photography through a SLR or DSLR camera, you may have already been introduced to the qualities of a polarizing filter, since it is a very popular accessory for polarizing the light and making the sky appear more blue. You will especially appreciate a polarizing filter when viewing over water or photographing a scene that includes a river or body of water. Simply turn the filter until you achieve the most glare-free results—you will really see the difference!\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;\"\u003eThe Optolong 1.25” Variable Polarizing Filter is made with Schott glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. The filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved. The result is a super thin filter cell that will produce a clear aperture of 26mm.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-weight: bold; font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-weight: bold; font-family: Arial;\"\u003eQuality Filter Materials:\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;\"\u003eSchott B260 substrate material from Germany, 2.0mm thick\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eCNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eMultiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition\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-weight: bold; font-family: Arial;\"\u003eOptolong Filter Manufacturing Processes and Parameters\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;\"\u003eFilter substrate is fine-optically polished to 1\/4 wave and \u0026lt;30 parallelism over both surfaces\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eSurface quality, according to MIL-O-13830, is 60\/40\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e95% transmission\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eHigh value transmission of pass-band and optical density of off-band is assured through Optolong’s planetary rotation system, a homogenous and precise coating procedure\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThin metal cells have a clear aperture of 26mm for 1.25” filters\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eEach filter comes with a plastic case with high pressure EVA case lining\u003c\/span\u003e\u003c\/div\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44013688160367,"sku":"VPO-125","price":59.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/variable_polarizer_125_grande_1__48237.png?v=1766559804"},{"product_id":"optolong-planetary-filter-kit-1-25","title":"Optolong Planetary Filter Kit - 1.25\"","description":"\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb center font-size:=\"\" background-color:=\"\" text-align:=\"\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-size: 18px;\"\u003e\u003cstrong style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eOptolong Planetary Filters Kit \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eOptolong Planetary filters kit including UV\/IR Cut, R, G, B and IR685 filter, 5pcs filters in total. These five filters are bundled by \"Solar System Seal\".\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cstrong style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eWhat filters are used for Planetary photography?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003ePhotography of planets and deepsky imaging, both are fine to use the combination of monochrome camera and filters. But slightly different, planets photography will not use what deepsky image use like Ha, SII, OIII filter. Planetary photography using filters often are IR, UV, filters, etc. \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eThe main aim is to capture the specific spectrum, such as rich carbon dioxide. One of the most common filter used is an infrared filter or IR filter\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eIn nature, the longer the wavelength of light, the less affected it is by atmospheric seeing. Relatively, receiving the influence of red light, or infrared light is far less than the other bands. \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eThus when imaging a planet, and to aid in reducing the influence of less than optimal seeing conditions, the use of an an IR filter is used to capture  only  infrared, or near-infrared light. \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eIn visible light, planetary imagers will use the more traditional RGB filters. For Mercury, Venus, Uranus and Neptune, IR685 comes fist, and for Saturn, Jupiter, UV\/IR Cut, R, G, B are good. However, the portfolio of IRRGB is popular. \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cstrong 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; background-color: rgb(0, 0, 205); color: rgb(255, 255, 255);\"\u003eIR685 Introduction\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eOptolong IR Pass685 filter is designed to block the most visible lights and can be used in IR-LRGB imaging to produce a sharper luminance image for the best planetary contrast as atmospheric seeing and distortion is much reduced at longer IR wavelengths. The advantage of the IR685 filter is to reduce the effects of atmospheric jitter. \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eThe sensor of  a CCD or CMOS camera is capable of detecting light in the 350nm -1100nm range including infrared wavelengths. Optolong IR685 cuts off the visible part of the spectrum and allows near infrared light to pass.  In poor seeing conditions the light signal that is most effected by this atmospheric condition is rejected. It will highly improves images on visibility, contrast and details of planets and the moon.  IR685 is usually used as a key factor of portfolio IRRGB. \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eImaging Target:\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eIR685 is for imaging of bright planets, stars, and comet, like Uranus, Neptune, Jupiter, Saturn, Mars, Moon, et. \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e\u003cstrong style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eIR685 Spectrum for Reference\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb center font-size:=\"\" background-color:=\"\" text-align:=\"\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/a55a2444e33d1df2170a42299f735741_c208151a-805b-45e5-acb8-5b4a87dc48bf.png?v=1766561971\" style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; border: none; vertical-align: middle; max-width: 100%; height: 346px; width: 631px;\"\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eHow to read the chart?\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eThe horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eThe vertical axis is Transmission in %.\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e\u003cstrong style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eIR685 characteristic:\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eTave: T\u0026gt;95%\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eTransmission area: 700-1100nm\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eBlocking are:  300-600nm\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eBlocking depth: blocked\u0026gt;99%\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eSurface quality: 60\/40(Refer to MIL-O-13830)\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eSurface accuracy: ?\/4\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eParallelism: 30'\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-size: 16px;\"\u003e\u003cstrong style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; background-color: rgb(0, 0, 205); color: rgb(255, 255, 255);\"\u003eUV\/IR Cut, R, G, B Filters Introduction\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eUV and IR light focus at a different point.  Optolong UV\/IR Cut filter is designed for ultraviolet and infrared wavelength blocking to improve sharpness of the image as most of the optics are designed for the visible spectrum.  This will eliminate star bloat from your images.  \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eOptolong RGB set divides the spectrum into its components red, green and blue. \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e\u003cstrong style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eRGB, parfocal: 1:1:1\u003c\/strong\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eCreate images in their true original colors showing a wealth of natural detail;\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eSteep bandpass filters to eliminate UV and IR interference;\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eUV\/IR Cut, Red, Green, and Blue filters to reproduce the star's color;\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cstrong style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eMain use \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eIn visible light, astrophotographers are use  traditional RGB fitters. If you have Optolong LRGB filters, just try R filter for moon photography, and expect good results. If you want more clear details of the Moon, then consider Optolong IR685 filter.\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eSuitable for color CMOS and CCD cameras and modified DSLRs;\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eAvailable to assist in focusing;\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eAct as an outstanding dust shield, which prevents the possibility of dust settling on the lens when long time exposure. \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e\u003cstrong style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eUV\/IR Cut, R, G, B Filters Spectrum for Reference\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb center font-size:=\"\" background-color:=\"\" text-align:=\"\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/3a6352900ea5f34a85be941765242934_753e81ef-dd74-4e51-8e0b-da9d5e87f5d0.png?v=1766561972\" style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; border: none; vertical-align: middle; max-width: 100%; height: 495px; width: 800px;\"\u003e\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eHow to read the chart?\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eThe horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eThe vertical axis is Transmission in %.\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003eThe WHITE line shows the transmission of the UV\/IR Cut filter. R filters line is shown in RED. G filter line is shown in GREEN. And the B filter line is shown in BLUE.\u003c\/p\u003e\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei rgb font-size:=\"\" background-color:=\"\"\u003e \u003c\/p\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44013756579951,"sku":"O-UVIRGB685-1","price":349.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/o-UVIRRGB685__63068.jpg?v=1766561975"},{"product_id":"optolong-variable-polarizer-filter-2","title":"Optolong Variable Polarizer Filter - 2\"","description":"\u003cdiv\u003e\u003cspan style=\"font-weight: bold; font-family: Arial;\"\u003eOptolong Variable Polarizing Filter - 1.25”\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eAdjust the brightness level of the Moon, Venus, and other bright objects with the Optolong Variable Polarizer. A standard Moon Filter is similar to a pair of sunglasses. They work fine, but sometimes the scene is too dark or too bright, and there’s not a lot you can do about it. A variable polarizing filter is much more flexible than a Moon filter. It allows you to set the percentage of attenuation by turning the top section of the two-piece filter. Simply attach the 1.25” threaded filter to a like-sized eyepiece or astro accessory barrel, and then slowly rotate the top half of the filter—it turns 360°—to achieve the results you desire. Now you can apply more filtering to a full moon and less to a beautiful crescent—it’s your call!\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;\"\u003eThe Optolong 1.25” Variable Polarizing Filter also works great to cut brightness when you are using your telescope for terrestrial observations or photography. If you have ever done photography through a SLR or DSLR camera, you may have already been introduced to the qualities of a polarizing filter, since it is a very popular accessory for polarizing the light and making the sky appear more blue. You will especially appreciate a polarizing filter when viewing over water or photographing a scene that includes a river or body of water. Simply turn the filter until you achieve the most glare-free results—you will really see the difference!\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;\"\u003eThe Optolong 1.25” Variable Polarizing Filter is made with Schott glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. The filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved. The result is a super thin filter cell that will produce a clear aperture of 26mm.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-weight: bold; font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-weight: bold; font-family: Arial;\"\u003eQuality Filter Materials:\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;\"\u003eSchott B260 substrate material from Germany, 2.0mm thick\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eCNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eMultiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition\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-weight: bold; font-family: Arial;\"\u003eOptolong Filter Manufacturing Processes and Parameters\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;\"\u003eFilter substrate is fine-optically polished to 1\/4 wave and \u0026lt;30 parallelism over both surfaces\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eSurface quality, according to MIL-O-13830, is 60\/40\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e95% transmission\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eHigh value transmission of pass-band and optical density of off-band is assured through Optolong’s planetary rotation system, a homogenous and precise coating procedure\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThin metal cells have a clear aperture of 26mm for 1.25” filters\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eEach filter comes with a plastic case with high pressure EVA case lining\u003c\/span\u003e\u003c\/div\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44013884276847,"sku":"VPO-2","price":79.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/variable_polarizer_125_grande_1__34952.png?v=1766565480"},{"product_id":"nd3-0-neutral-density-filter-1-25","title":"ND3.0 neutral density filter 1.25\"","description":"\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e1.  Neutral Density Filters Introduction\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNeutral Density (ND) filters are designed to reduce transmission evenly acorss a portion of a specific spectrum. ND filters are typically defined by their Optical Density (OD) which describes the amount of energy blocked by the filter. A high optical density value indicates very low transmission, and low optical density indicates high transmission (Equations 1-2). ND filters can be stacked to achieve a customs optical density. To calculate the final system OD, simply add the OD of each filter together.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTypes of Neutral Density Filters\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThere are two types of ND filters: reflective and absorptive.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eReflective ND filters\u003c\/strong\u003e consist of thin film optical coating, typically metallic, that have been applied to a galls substrate. The coating can be optimized for specific wavelength ranges such as UV-VIS or NIR. Thin film coaitng primarily reflects light back toward the source. Special care should be taken to ensure the reflected light does not interfere with the system setup.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eAbsorptive ND filters\u003c\/strong\u003e utlize a glass substrate to absorb light by a specific percentage.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e2. ND3.0 Filter Characteristic\u003c\/strong\u003e\u003cbr\u003eSbustrate: optical galss\u003cbr\u003eThickness: 1.85mm\u003cbr\u003eT=0.1%\u003cbr\u003eSurface quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003e Parallelism: 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e3. Coating 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","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44014103658607,"sku":"O-ND3-1","price":79.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ND3-a__80533.jpg?v=1766571329"}],"url":"https:\/\/ontariotelescope.com\/collections\/optolong-visual-planetary.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}