{"title":"Filters","description":"\u003cp\u003eBrowse our Filters collection. Best Price.\u003c\/p\u003e","products":[{"product_id":"optolong-clear-sky-filter-screw-on-lens","title":"Optolong Clear Sky Filter Screw on Lens","description":"\u003ch2\u003eOptolong Clear Sky Filter Screw on Lens\u003c\/h2\u003e\n1. Optolong Clear Sky Filter Introduction\n\u003cul\u003e\n \t\u003cli\u003eA screw on filter with the easiest installation way like UV filter.\u003c\/li\u003e\n \t\u003cli\u003eSupress light pollution to make the night sky clearly.\u003c\/li\u003e\n \t\u003cli\u003eEnhance the contrast of images.\u003c\/li\u003e\n \t\u003cli\u003eTo bring up the colors, fascinating experience.\u003c\/li\u003e\n\u003c\/ul\u003e\n2. Coating Technology\n\n·Multi-layers anti-reflection coating\n\n·Non-cementing optical substrate coating\n\n·Optolong L-Pro 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.\n\n·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.","brand":"Optolong","offers":[{"title":"M77 Mounted","offer_id":48411392508162,"sku":"ize1787937250710","price":110.18,"currency_code":"USD","in_stock":true},{"title":"M82 Mounted","offer_id":48411392540930,"sku":"ija1787937250711","price":157.63,"currency_code":"USD","in_stock":true},{"title":"Nikon Z Full Frame ILDC Clip-in","offer_id":48411392573698,"sku":"jxp1787937250712","price":101.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0754\/3862\/0930\/files\/optolong-clear-sky-filter-screw-on-lens_1.png?v=1787937260"},{"product_id":"optolong-improved-oiii-65nm-narrowband-filter","title":"Optolong Improved OIII 6.5nm Narrowband Filter","description":"\u003ch2\u003eOptolong Improved OIII 6.5nm Narrowband Filter\u003c\/h2\u003e\n\u003cp\u003eOptolong improved extra Narrowband OIII-CCD 6.5nm filter is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).\u003c\/p\u003e\n\u003cp\u003eOIII emits 495.9nm and 500.7nm and it is a blue-green colored filter. Many of images of planetary nebula and supernova remnants are taken only with H-alpha and OIII filters. They show great structural details, but have natural colors, looking like an RGB image.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain use and performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSuitable for viewing on faint emission nebula of H-Alpha line in full moonlight or in severe light pollution.\u003c\/p\u003e\n\u003cp\u003eHubble look of images can be made by the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula).\u003c\/p\u003e\n\u003cp\u003eNarrowband imaging with SHO kit (H-alpha7nm, OIII 6.5nm and SII6.5nm) can be done with the moon up in heavy light pollution, so your equipment is not sitting dormant for several weeks.\u003c\/p\u003e\n\u003cp\u003eNarrowband filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/files\/Optolong_O-III_CCD_6.5NM.jpg?v=1526319792\u0026amp;width=700\" alt=\"Optolong LRGB HA SII \u0026amp; OIII Telescope Filter Kit-OIII Graph\"\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▲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▲The GREEN line shows the transmission of the OIII6.5nm filter. \u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"http:\/\/optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg?width=700\" width=\"767\" height=\"126\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":48411392606466,"sku":"mxc1787937260027","price":107.49,"currency_code":"USD","in_stock":true},{"title":"2\"","offer_id":48411392639234,"sku":"omy1787937260028","price":185.0,"currency_code":"USD","in_stock":true},{"title":"31mm","offer_id":48411392672002,"sku":"aqx1787937260029","price":133.59,"currency_code":"USD","in_stock":true},{"title":"36mm","offer_id":48411392704770,"sku":"gvt1787937260030","price":139.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0754\/3862\/0930\/files\/optolong-improved-oiii-65nm-narrowband-filter_1.png?v=1787937269"},{"product_id":"optolong-sii-65nm-imaging-narrowband-filter","title":"Optolong SII 6.5nm Imaging Narrowband Filter","description":"\u003ch2\u003eOptolong SII 6.5nm Imaging Narrowband Filter\u003c\/h2\u003e\n\u003cp\u003eOptolongimproved narrowband SII6.5nm filter (Sulful II for CCD) is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both highand low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain use and performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSuitable for viewing on faint emission nebula of H-Alpha line in full moonlight or in severe light pollution.\u003c\/p\u003e\n\u003cp\u003eHubble look of images can be made by the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula).\u003c\/p\u003e\n\u003cp\u003eNarrowband imaging with SHO kit (H-alpha7nm, OIII 6.5nm and SII6.5nm) can be done with the moon up in heavy light pollution, so your equipment is not sitting dormant for several weeks.\u003c\/p\u003e\n\u003cp\u003eNarrowband filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/optolong.com\/uploads\/images\/20210703\/3427717cb1f3057669a8ab02ddfd6cd6.png?width=700\" width=\"545\" height=\"317\"\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▲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▲ The SII6.5nm filter line is shown in\u003cstrong\u003e\u003cspan style=\"color: #0d5bc9;\"\u003e BLUE.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg?width=700\" width=\"597\" height=\"98\"\u003e\u003c\/p\u003e\n\u003ch3\u003eIn The Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Years Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":48411392737538,"sku":"sam1787937260442","price":104.28,"currency_code":"USD","in_stock":true},{"title":"2\"","offer_id":48411392770306,"sku":"ydk1787937260443","price":164.19,"currency_code":"USD","in_stock":true},{"title":"31mm","offer_id":48411392803074,"sku":"ctb1787937260444","price":135.3,"currency_code":"USD","in_stock":true},{"title":"36mm","offer_id":48411392835842,"sku":"zky1787937260445","price":127.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0754\/3862\/0930\/files\/optolong-sii-65nm-imaging-narrowband-filter_1.png?v=1787937270"},{"product_id":"optolong-clear-focusing-filter","title":"Optolong Clear Focusing Filter","description":"\u003ch2\u003eOptolong Clear Focusing Filter\u003c\/h2\u003e\n\u003cp\u003eOptolong Clear focusing filter is designed to highly pass the visible spectral region 420-680nm at 98.5% transmission.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUse of astrophotography filters, especially narrowband filters, often results in dim images which can be difficult to focus. Clear focusing filter can be used first to clearly focus the image.\u003c\/p\u003e\n\u003cp\u003eUse with modified DSLRs for higher efficiency and sensitivity by passing visible range with 98.5% transmission.\u003c\/p\u003e\n\u003cp\u003eAct as an outstanding dust shield, which prevents the possibility of dust settling on the lens during long time exposure.\u003c\/p\u003e\n\u003cp\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\/p\u003e\n\u003ch3\u003eTechnical Specifications  \u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eSbustrate: B270\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness: 1.85mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTave:  T\u0026gt;98.5%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSurface quality: 60\/40\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTransmitted Wavefront RMS: λ\/4\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eParallelism: 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/optolong.com\/uploads\/images\/20201125\/17144ed49cbdafca3c8e855b1129a71a.png?width=700\" width=\"499\" height=\"326\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eHow to read the chart?\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\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan\u003eFilter\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eManual \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":48411392868610,"sku":"mxl1787937260652","price":15.5,"currency_code":"USD","in_stock":true},{"title":"2\"","offer_id":48411392901378,"sku":"ahp1787937260653","price":19.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0754\/3862\/0930\/files\/optolong-clear-focusing-filter_1.png?v=1787937270"},{"product_id":"optolong-moon-skyglow-filter","title":"Optolong Moon \u0026 Skyglow Filter","description":"\u003ch2\u003eOptolong Moon \u0026amp; Skyglow Filter\u003c\/h2\u003e\n\u003cp\u003eOptolong Moon \u0026amp; Skyglow filter is designed to darken the background sky by blocking light transmission from skyglow 589nm and many street light emissions from artificial light. Its high efficiency preserves image brightness, reveals more details and increases contrast of moon, galaxies, nebulae and globular star clusters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIdeally it is quite versatile filter for visual observation and astrophotography on planetary nebula.\u003c\/p\u003e\n\u003cp\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\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eSubstrate: B270\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness: 1.85mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTave:  T\u0026gt;90%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlocking range: 350-1050nm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlocking depth: light pollution  line blocking \u0026gt;99%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSurface quality: 60\/40\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTransmitted Wavefront RMS: λ\/4\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eParallelism: 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eFilter\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Years Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":48411392934146,"sku":"ckv1787937260729","price":19.4,"currency_code":"USD","in_stock":true},{"title":"2\"","offer_id":48411392966914,"sku":"tqc1787937260730","price":34.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0754\/3862\/0930\/files\/optolong-moon-skyglow-filter_1.png?v=1787937270"},{"product_id":"optolong-uvir-cut-filter","title":"Optolong UV\/IR CUT filter","description":"\u003ch2\u003eOptolong UV\/IR CUT\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003eOptolong 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, because it’s very difficult to create a lens with the same focal point for the visible and IR spectrum.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eIt is used on a digital camera and the video, which do not have an IR protection filter toward an image sensor or were remodeled. This is important because unfiltered CCD and CMOS sensors are extremely susceptible to UV and IR rays just outside the visible spectrum that can have a very negative impact on image quality.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eMain Use and Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSuitable for color CMOS and CCD cameras and modified DSLRs.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUse with monochrome CCD for astrophotography.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAvailable to assist in focusing.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAct as an outstanding dust shield, which prevents the possibility of dust settling on the lens during long time exposure.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\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\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/optolong.com\/uploads\/images\/20210621\/ae00cf1d3abbdeca0160763948615996.png?width=700\" width=\"540\" height=\"349\"\u003e\u003c\/p\u003e\n\u003cp\u003eHow to read the chart?\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▲The RED line shows the transmission of the UV\/IR Cut filter.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg?width=700\" alt=\"\" width=\"609\" height=\"100\"\u003e\u003c\/p\u003e\n\u003ch3\u003eIn The Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Years Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":48411392999682,"sku":"zkv1787937263415","price":33.06,"currency_code":"USD","in_stock":true},{"title":"2\"","offer_id":48411393032450,"sku":"nim1787937263416","price":39.02,"currency_code":"USD","in_stock":true},{"title":"31mm","offer_id":48411393065218,"sku":"bvj1787937263417","price":35.51,"currency_code":"USD","in_stock":true},{"title":"36mm","offer_id":48411393097986,"sku":"lyi1787937263418","price":41.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0754\/3862\/0930\/files\/optolong-uvir-cut-filter_1.png?v=1787937273"}],"url":"https:\/\/welcomingwillow.shop\/collections\/filters.oembed","provider":"My Store","version":"1.0","type":"link"}