{"title":"UV\/IR Cut \u0026 IR Pass","description":"\u003cp\u003eUV\/IR Cut \u0026amp; IR Pass from every brand we carry. Part of \u003ca href=\"\/collections\/filters\"\u003eFilters\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"zwo-ir-cut-filter","title":"ZWO 1.25\" UV\/IR Cut Filter","description":"\u003ch2\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eZWO 1.25\" UV\/IR Cut Filter\u003c\/strong\u003e is a simple but important imaging accessory for colour astronomy cameras, especially cameras with an AR protect window rather than a built-in UV\/IR blocking window. It blocks ultraviolet and infrared light from reaching the camera sensor, helping produce sharper, cleaner visible-light images.\u003c\/p\u003e\n\u003cp\u003eSilicon camera sensors are sensitive beyond the visible spectrum, including infrared. Since most telescope optics are not designed to bring infrared light to the same focus as visible light, unwanted IR can soften stars and reduce image sharpness. A UV\/IR cut filter helps keep the recorded image focused on the visible spectrum.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWho Is This Product Best For?\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis filter is best for astrophotographers using colour CMOS or CCD cameras that need UV\/IR blocking for sharper broadband imaging. It is especially useful with ZWO colour cameras that have an AR protect window instead of an integrated IR-cut window.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhy Choose This Product?\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSharper colour-camera images:\u003c\/strong\u003e Blocks out-of-focus infrared light that can soften stars and fine detail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtects downstream filters:\u003c\/strong\u003e ZWO notes it can help protect expensive H-alpha filters from infrared radiation during solar-related setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25\" threaded format:\u003c\/strong\u003e Fits common 1.25\" astronomy filter holders, filter wheels, and accessory threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtective case included:\u003c\/strong\u003e The vendor lists a protective plastic case with the filter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBroadband colour astrophotography\u003c\/li\u003e\n\u003cli\u003ePlanetary imaging with colour cameras\u003c\/li\u003e\n\u003cli\u003eLunar imaging\u003c\/li\u003e\n\u003cli\u003eVisible-light imaging through telescopes that do not focus IR cleanly\u003c\/li\u003e\n\u003cli\u003eColour cameras with AR protect windows\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis listing is for the \u003cstrong\u003e1.25\" ZWO UV\/IR Cut Filter\u003c\/strong\u003e. ZWO also offers a 2\" version as a separate size. The 1.25\" version is suitable for common 1.25\" filter cells, filter wheels, and imaging accessories where the optical path accepts 1.25\" mounted filters.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eImportant Limitations\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot a narrowband filter:\u003c\/strong\u003e This is a UV\/IR blocking filter, not an H-alpha, OIII, SII, or light-pollution filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse the correct size:\u003c\/strong\u003e Choose the 1.25\" or 2\" version based on your camera, filter wheel, filter drawer, and optical train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot needed for every camera:\u003c\/strong\u003e Some cameras already include UV\/IR blocking glass. Check your camera window before adding another filter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat does this filter block?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIt blocks ultraviolet and infrared light so the camera records primarily the visible spectrum.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy do colour astronomy cameras need a UV\/IR cut filter?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eMany sensors are sensitive to infrared light. If that infrared light reaches the sensor, stars and fine detail can appear softer because the telescope may not focus IR at the same point as visible light.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDoes it come with a case?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eYes. ZWO lists a protective plastic case with the 1.25\" filter.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eOur Recommendation\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eOntario Telescope recommends the ZWO 1.25\" UV\/IR Cut Filter for colour-camera imaging setups that need clean visible-light capture and sharper star profiles. It is a small accessory that can make a noticeable difference when your camera or optical train does not already include effective UV\/IR blocking.\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44013050593391,"sku":"IR-CUT","price":40.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ir-uv-cut-filter-astronomy-460x460__87936.jpg?v=1766548483"},{"product_id":"zwo-ir-850nm-filter","title":"ZWO 1.25\" IR 850nm Pass Filter","description":"\u003ch2\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eZWO 1.25\" IR 850nm Pass Filter\u003c\/strong\u003e is an infrared-pass astronomy filter for lunar and planetary imaging. It allows infrared light above approximately 850nm to pass while reducing the visible-light portion of the spectrum that is most affected by atmospheric seeing.\u003c\/p\u003e\u003cp\u003eWhen used with a monochrome camera or a colour camera that is sensitive to infrared, an 850nm IR-pass filter can help improve image steadiness and contrast during less-than-ideal seeing conditions. It can also be useful when imaging the Moon or planets at lower altitude, where atmospheric turbulence is more noticeable.\u003c\/p\u003e\u003ch2\u003e\u003cstrong\u003eWho Is This Product Best For?\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eThis filter is best for planetary and lunar imagers using IR-sensitive astronomy cameras. It is useful for imagers who want to capture steadier detail when visible-light seeing conditions are poor.\u003c\/p\u003e\u003ch2\u003e\u003cstrong\u003eWhy Choose This Product?\u003c\/strong\u003e\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e850nm IR-pass performance:\u003c\/strong\u003e Passes infrared light above approximately 850nm for specialized lunar and planetary imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelps with poor seeing:\u003c\/strong\u003e Longer infrared wavelengths are less affected by atmospheric turbulence than shorter visible wavelengths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUseful near the horizon:\u003c\/strong\u003e Can help when imaging planets or the Moon at lower elevations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25\" format:\u003c\/strong\u003e Fits common 1.25\" filter holders, filter wheels, and planetary-camera accessories.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePlanetary imaging\u003c\/li\u003e\n\u003cli\u003eLunar imaging\u003c\/li\u003e\n\u003cli\u003eInfrared imaging with IR-sensitive cameras\u003c\/li\u003e\n\u003cli\u003eHigh-resolution imaging during poor seeing\u003c\/li\u003e\n\u003cli\u003eImaging targets at lower altitude\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eThis listing is for the \u003cstrong\u003e1.25\" ZWO IR 850nm Pass Filter\u003c\/strong\u003e. It should be used with a camera that has useful sensitivity at 850nm. Some colour cameras and many monochrome planetary cameras can record infrared wavelengths, but performance depends on the camera sensor and optical setup.\u003c\/p\u003e\u003ch2\u003e\u003cstrong\u003eImportant Limitations\u003c\/strong\u003e\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot a UV\/IR cut filter:\u003c\/strong\u003e This filter passes infrared light; it does not block IR for visible-light colour imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera sensitivity matters:\u003c\/strong\u003e The camera must be sensitive at approximately 850nm for this filter to be effective.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecialized use:\u003c\/strong\u003e This is mainly for lunar, planetary, and infrared imaging, not general deep-sky colour imaging.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h2\u003e\u003ch3\u003e\u003cstrong\u003eWhat does an IR 850nm pass filter do?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIt allows infrared wavelengths above approximately 850nm to pass while reducing shorter visible wavelengths.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhy use this filter for planets?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eInfrared wavelengths are less disturbed by atmospheric seeing, so an IR-pass filter can help produce steadier planetary detail when conditions are not ideal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCan I use this with a colour camera?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eYes, if the colour camera is sensitive to infrared. The result will not be standard full-colour imaging; this is a specialized infrared imaging filter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eIs this the same as a UV\/IR cut filter?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eNo. A UV\/IR cut filter blocks infrared for visible-light imaging. This IR 850nm filter passes infrared for specialized imaging.\u003c\/p\u003e\u003ch2\u003e\u003cstrong\u003eOur Recommendation\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eOntario Telescope recommends the ZWO 1.25\" IR 850nm Pass Filter for lunar and planetary imagers who want a specialized tool for improving detail in challenging seeing conditions with IR-sensitive cameras.\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44013052625007,"sku":"IR-850","price":40.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ir850-filter-planets-moon-460x460__42969.jpg?v=1766548492"},{"product_id":"daystar-2-uv-ir-filter","title":"Daystar 2\" UV\/IR Filter","description":"\u003cspan style=\"color: rgb(47, 47, 47); font-family: Arial, Helvetica, sans-serif; font-size: 12px; line-height: 18.6px; background-color: rgb(250, 247, 238);\"\u003eBlocks all other parts of the spectrum in the UV and IR. The Astronomik UV-IR Blocker is the ideal choice as a luminance filter for any kind of digital photography. Because of the perfect blocking of UV and IR, all optical problems in these parts of the spectrum are avoided. It blocks the heat from reaching your filter and diagonal as well. The filter is optimized for systems with focal ratios between f\/0.5 and f\/50. The typical transmission is higher than 99%.\u003c\/span\u003e","brand":"Daystar Filters","offers":[{"title":"Default Title","offer_id":44013298647151,"sku":"DSIUV2","price":169.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/img_20140703_153847__40661.jpg?v=1766550582"},{"product_id":"skyris-ir-block-filter","title":"Skyris IR-Block Filter","description":"\u003ch1\u003e\u003cspan style=\"font-size:20.0pt;mso-bidi-font-size:24.0pt;font-family:\" arial mso-fareast-font-family: new roman\u003eOverview\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h1\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:10.0pt;      mso-bidi-font-size:12.0pt;font-family:\" arial new roman\u003eHigh-quality, fully multi-coated optical glass with      dichroic coatings to block infrared (IR) light\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:10.0pt;      mso-bidi-font-size:12.0pt;font-family:\" arial new roman\u003eProvides the best color balance and sharpness\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:10.0pt;      mso-bidi-font-size:12.0pt;font-family:\" arial new roman\u003eTotally removable, providing ultimate flexibility--no      need to purchase a camera with built-in IR-block\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:10.0pt;      mso-bidi-font-size:12.0pt;font-family:\" arial new roman\u003eCompatible with Skyris color cameras and The Imaging      Source astronomy cameras\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e \u003c\/ul\u003e  \u003ch1\u003e\u003cspan style=\"font-size:20.0pt;mso-bidi-font-size:24.0pt;font-family:\" arial mso-fareast-font-family: new roman\u003eDescription\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h1\u003e  \u003cp\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:\" arial\u003eColor CCD cameras such as the Skyris color planetary cameras are very sensitive across the visual spectrum, as well as in infrared. Some telescopes may correct for chromatic aberration, but are not designed to correct for IR light, which can often look defocused in astroimages. Blocking infrared (IR) light provides the greatest color balance and sharpness in your astroimages. This filter blocks IR while passing more than 94% of the entire visual spectrum, maintaining color fidelity.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003ch1\u003e\u003cspan style=\"font-size:20.0pt;mso-bidi-font-size:24.0pt;font-family:\" arial mso-fareast-font-family: new roman\u003eSpecifications\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h1\u003e  \u003ctable class=\"MsoNormalTable\" border=\"0\" cellpadding=\"0\"\u003e  \u003ctbody\u003e\n\u003ctr\u003e   \u003ctd style=\"padding:.75pt .75pt .75pt .75pt\"\u003e   \u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:   12.0pt;font-family:\" arial new roman\u003eOptical   Coatings\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:   12.0pt;font-family:\" arial new roman\u003e\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e   \u003c\/td\u003e   \u003ctd style=\"padding:.75pt .75pt .75pt .75pt\"\u003e   \u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:12.0pt;   font-family:\" arial new roman\u003eAnti-reflection   multi-coatings and dichroic IR-block coating\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e   \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e   \u003ctd style=\"padding:.75pt .75pt .75pt .75pt\"\u003e   \u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:   12.0pt;font-family:\" arial new roman\u003eCamera   Adaptable\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:   12.0pt;font-family:\" arial new roman\u003e\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e   \u003c\/td\u003e   \u003ctd style=\"padding:.75pt .75pt .75pt .75pt\"\u003e   \u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:12.0pt;   font-family:\" arial new roman\u003eStandard   C-thread\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e   \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e   \u003ctd style=\"padding:.75pt .75pt .75pt .75pt\"\u003e   \u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:   12.0pt;font-family:\" arial new roman\u003eClear   Aperture (mm)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:   12.0pt;font-family:\" arial new roman\u003e\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e   \u003c\/td\u003e   \u003ctd style=\"padding:.75pt .75pt .75pt .75pt\"\u003e   \u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:12.0pt;   font-family:\" arial new roman\u003e19.5   mm (0.77 in)\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e   \u003c\/td\u003e  \u003c\/tr\u003e \u003c\/tbody\u003e\n\u003c\/table\u003e  \u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:12.0pt; font-family:\" arial new roman\u003e \u003c\/span\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44013318865007,"sku":"95516","price":59.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/95516_252520Skyris_252520IR-Block_252520Filter_01__70509.1682634917.1280.1280.jpg?v=1766550688"},{"product_id":"baader-1-25-uvir-filter","title":"Baader 1.25\" UVIR filter","description":"\u003ccenter style=\"margin: 15px 0px; padding: 0px; font-family: \" open sans sans-serif font-size:=\"\"\u003e\u003ch2 style=\"margin: 0px; padding: 0px; font-size: 16px;\"\u003eBaader UV - IR Cut L Filter - 1.25\" Mounted\u003c\/h2\u003e\u003c\/center\u003e\u003cp style=\"margin: 10px 0px; padding: 0px; font-family: \" open sans sans-serif justify font-size:=\"\" text-align:=\"\"\u003eThe Baader UV-IR Cut\/L Filter is a must for all digital imaging with DSLR cameras, CCD cameras, and modified webcams. It removes the unwanted UV and IR wavelengths from your images by blocking UV below 400 nm and IR above 680 nm. The Baader UV-IR Cut filter is also useful for protecting valuable H-Alpha filters from heat stress and damaging IR (Daystar, etc). This UV-IR Cut filter is mounted in a 1.25\" threaded low profile cell.\u003c\/p\u003e\u003cp style=\"margin: 10px 0px; padding: 0px; font-family: \" open sans sans-serif justify font-size:=\"\" text-align:=\"\"\u003eDue to their extremely high optical quality, these filters may be stacked and used far in front of the focal plane (necessary for imaging uses). Like the Baader Planetarium Contrast-Booster, the UV \/ IR Cut filter uses the very latest coating technology to deliver the finest filtration quality, and lifetime durability. This filter is mounted in a round 1.25\" threaded cell.\u003c\/p\u003e\u003ccenter style=\"margin: 15px 0px; padding: 0px; font-family: \" open sans sans-serif font-size:=\"\"\u003e\u003ch2 style=\"margin: 0px; padding: 0px; font-size: 16px;\"\u003eBaader UV \/ IR Cut Filter Features:\u003c\/h2\u003e\u003c\/center\u003e\u003cul style=\"margin: 5px 40px; padding: 0px; list-style: none; font-family: \" open sans sans-serif justify font-size:=\"\" text-align:=\"\"\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eUnmatched 98% average transmission\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eFreedom from ghost images; very low reflection multi-coating, striae-free, and plane-parallel substrate\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eExtremely sharp cutoff at 690 nm but leaves all the visible red, including the important 656 nm H-alpha emission line\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eSharp cutoff below 400 nm\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eEliminates violet halos around bright stars, more effectively than simpler Minus Violet photographic filters\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eTrue optical quality glass substrate and coatings; don't spend all your money on quality telescope optics, only to place a lower grade filter in the light path\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eCombine with any of the Baader filters to deliver the sharpest images possible\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44013368082543,"sku":"FUVIR-1","price":104.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/baader_uvir-cut-l-filter_125inch__32301.jpg?v=1766551437"},{"product_id":"baader-2-uvir-filter","title":"Baader 2\" UVIR filter","description":"\u003ccenter style=\"margin: 15px 0px; padding: 0px; font-family: \" open sans sans-serif font-size:=\"\"\u003e\n\u003ch2 style=\"margin: 0px; padding: 0px; font-size: 16px; font-weight: bold; color: rgb(0, 0, 0);\"\u003eBaader UV-IR Cut L Filter - 2\" Mounted\u003c\/h2\u003e\n\u003ch2 style=\"margin: 0px; padding: 0px; font-size: 16px;\"\u003e\u003ccenter style=\"margin: 15px 0px; padding: 0px; font-size: 12px; font-weight: normal;\"\u003e\u003c\/center\u003e\u003c\/h2\u003e\n\u003cp style=\"margin: 10px 0px; padding: 0px; font-size: 12px; font-weight: normal; text-align: justify;\"\u003eThe Baader UV-IR Cut\/L Filter is a must for all digital imaging with DSLR cameras, CCD cameras, and modified webcams. It removes the unwanted UV and IR wavelengths from your images by blocking UV below 400 nm and IR above 680 nm. The Baader UV-IR Cut filter is also useful for protecting valuable H-Alpha filters from heat stress and damaging IR (Daystar, etc). This UV-IR Cut filter is mounted in a 2\" threaded low profile cell.\u003c\/p\u003e\n\u003cp style=\"margin: 10px 0px; padding: 0px; font-size: 12px; font-weight: normal; text-align: justify;\"\u003eDue to their extremely high optical quality, these filters may be stacked and used far in front of the focal plane (necessary for imaging uses). Like the Baader Planetarium Contrast-Booster, the UV \/ IR Cut filter uses the very latest coating technology to deliver the finest filtration quality, and lifetime durability.\u003c\/p\u003e\n\u003ch2 style=\"margin: 0px; padding: 0px; font-size: 16px;\"\u003eBaader UV \/ IR Cut Filter Features:\u003c\/h2\u003e\n\u003ch2 style=\"margin: 0px; padding: 0px; font-size: 16px;\"\u003e\n\u003ccenter style=\"margin: 15px 0px; padding: 0px; font-size: 12px; font-weight: normal;\"\u003e\u003c\/center\u003e\n\u003cul style=\"margin: 5px 40px; padding: 0px; list-style: none; font-size: 12px; font-weight: normal; text-align: justify;\"\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eUnmatched 98% average transmission\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eFreedom from ghost images; very low reflection multi-coating, striae-free, and plane-parallel substrate\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eExtremely sharp cutoff at 690 nm but leaves all the visible red, including the important 656 nm H-alpha emission line\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eSharp cutoff below 400 nm\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eEliminates violet halos around bright stars, more effectively than simpler Minus Violet photographic filters\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eTrue optical quality glass substrate and coatings; don't spend all your money on quality telescope optics, only to place a lower grade filter in the light path\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eCombine with any of the Baader filters to deliver the sharpest images possible\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/h2\u003e\n\u003c\/center\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44013368115311,"sku":"FUVIR-2","price":188.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/bad_fuvir_2__65912.jpg?v=1766551444"},{"product_id":"zwo-ir-cut-filter-2","title":"ZWO 2\" UV\/IR Cut Filter","description":"\u003ch2\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eZWO 2\" UV\/IR Cut Filter\u003c\/strong\u003e is a full-size astronomy imaging filter designed to block ultraviolet and infrared light from reaching your camera sensor. It is useful with colour astronomy cameras that use an AR protect window rather than built-in UV\/IR blocking glass.\u003c\/p\u003e\u003cp\u003eMany astronomy camera sensors remain sensitive to infrared light. Since most telescope optics do not focus infrared at exactly the same point as visible light, unblocked IR can soften star profiles and reduce image sharpness. A UV\/IR cut filter helps keep the recorded image focused on the visible spectrum.\u003c\/p\u003e\u003ch2\u003e\u003cstrong\u003eWho Is This Product Best For?\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eThis filter is best for astrophotographers using 2\" filter drawers, filter wheels, adapters, or larger imaging trains where a 1.25\" filter would be too small.\u003c\/p\u003e\u003ch2\u003e\u003cstrong\u003eWhy Choose This Product?\u003c\/strong\u003e\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" imaging format:\u003c\/strong\u003e Better suited to larger sensors and optical trains than a 1.25\" filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisible-light sharpening:\u003c\/strong\u003e Blocks out-of-focus ultraviolet and infrared light that can soften images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48 thread:\u003c\/strong\u003e ZWO lists the 2\" version with an M48×0.75 male thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple optical upgrade:\u003c\/strong\u003e Helps colour cameras produce cleaner visible-light images.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBroadband colour astrophotography\u003c\/li\u003e\n\u003cli\u003eLunar imaging\u003c\/li\u003e\n\u003cli\u003ePlanetary imaging with colour cameras\u003c\/li\u003e\n\u003cli\u003eVisible-light telescope imaging\u003c\/li\u003e\n\u003cli\u003e2\" filter drawers, filter wheels, and M48-threaded imaging trains\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eThis listing is for the \u003cstrong\u003e2\" ZWO UV\/IR Cut Filter\u003c\/strong\u003e. ZWO lists the 2\" version with a 5mm body plus 2mm thread thickness and an M48×0.75 male thread. Choose this version when your imaging train requires 2\" mounted filters or when using a larger sensor where a smaller 1.25\" filter could vignette.\u003c\/p\u003e\u003ch2\u003e\u003cstrong\u003eImportant Limitations\u003c\/strong\u003e\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot a narrowband filter:\u003c\/strong\u003e This is a UV\/IR blocking filter, not an H-alpha, OIII, SII, dual-band, or light-pollution filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize matters:\u003c\/strong\u003e Use the 2\" version only if your accessory train accepts 2\" \/ M48-threaded mounted filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera-dependent need:\u003c\/strong\u003e Some cameras already include UV\/IR blocking glass, so check your camera window before stacking filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h2\u003e\u003ch3\u003e\u003cstrong\u003eWhat does this filter block?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIt blocks ultraviolet and infrared light, allowing your camera to record primarily visible light.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhy use the 2\" version instead of 1.25\"?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 2\" version is better suited to larger sensors and imaging trains where a 1.25\" filter may restrict the light path.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat thread does the 2\" version use?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eZWO lists the 2\" version with an M48×0.75 male thread.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eIs this a light-pollution filter?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eNo. It is a UV\/IR cut filter for visible-light imaging, not a light-pollution reduction filter.\u003c\/p\u003e\u003ch2\u003e\u003cstrong\u003eOur Recommendation\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eOntario Telescope recommends the ZWO 2\" UV\/IR Cut Filter for larger colour-camera imaging setups that need clean visible-light capture, reduced star bloat, and compatibility with 2\" or M48-threaded imaging accessories.\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44013370572911,"sku":"IR-CUT-2","price":69.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2IRCUT-600X600__57863.jpg?v=1766551715"},{"product_id":"baader-uv-ir-cut-l-filter-36mm","title":"Baader UV\/IR Cut \/ L-Filter 36mm","description":"\u003ccenter style=\"margin: 15px 0px; padding: 0px; font-family: \" open sans sans-serif font-size:=\"\"\u003e\n\u003ch2 style=\"margin: 0px; padding: 0px; font-size: 16px; font-weight: bold; color: rgb(0, 0, 0);\"\u003eBaader UV-IR Cut L Filter - 2\" Mounted\u003c\/h2\u003e\n\u003ch2 style=\"margin: 0px; padding: 0px; font-size: 16px;\"\u003e\u003ccenter style=\"margin: 15px 0px; padding: 0px; font-size: 12px; font-weight: normal;\"\u003e\u003c\/center\u003e\u003c\/h2\u003e\n\u003cp style=\"margin: 10px 0px; padding: 0px; font-size: 12px; font-weight: normal; text-align: justify;\"\u003eThe Baader UV-IR Cut\/L Filter is a must for all digital imaging with DSLR cameras, CCD cameras, and modified webcams. It removes the unwanted UV and IR wavelengths from your images by blocking UV below 400 nm and IR above 680 nm. This UV-IR Cut filter is 36mm unmounted\u003c\/p\u003e\n\u003cp style=\"margin: 10px 0px; padding: 0px; font-size: 12px; font-weight: normal; text-align: justify;\"\u003eDue to their extremely high optical quality, these filters may be stacked and used far in front of the focal plane (necessary for imaging uses). Like the Baader Planetarium Contrast-Booster, the UV \/ IR Cut filter uses the very latest coating technology to deliver the finest filtration quality, and lifetime durability.\u003c\/p\u003e\n\u003ch2 style=\"margin: 0px; padding: 0px; font-size: 16px;\"\u003eBaader UV \/ IR Cut Filter Features:\u003c\/h2\u003e\n\u003ch2 style=\"margin: 0px; padding: 0px; font-size: 16px;\"\u003e\n\u003ccenter style=\"margin: 15px 0px; padding: 0px; font-size: 12px; font-weight: normal;\"\u003e\u003c\/center\u003e\n\u003cul style=\"margin: 5px 40px; padding: 0px; list-style: none; font-size: 12px; font-weight: normal; text-align: justify;\"\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eUnmatched 98% average transmission\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eFreedom from ghost images; very low reflection multi-coating, striae-free, and plane-parallel substrate\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eExtremely sharp cutoff at 690 nm but leaves all the visible red, including the important 656 nm H-alpha emission line\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eSharp cutoff below 400 nm\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eEliminates violet halos around bright stars, more effectively than simpler Minus Violet photographic filters\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eTrue optical quality glass substrate and coatings; don't spend all your money on quality telescope optics, only to place a lower grade filter in the light path\u003cp style=\"margin: 10px 0px; padding: 0px;\"\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px; list-style-type: disc;\"\u003eCombine with any of the Baader filters to deliver the sharpest images possible\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/h2\u003e\n\u003c\/center\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44013378469999,"sku":"FUVIR-RD36","price":188.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FUVIR-2__09596.jpg?v=1766552358"},{"product_id":"baader-ir-pass-filter-1-685-nm","title":"Baader IR-Pass Filter 1¼\" (685 nm)","description":"\u003cul style=\"box-sizing: border-box; margin: 0px 0px 1em 1em; padding: 0px; list-style-position: initial; list-style-image: initial; font-family: \" open sans sans-serif rgb color:=\"\" font-size:=\"\" background-color:=\"\"\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px; list-style: disc;\"\u003eBaader IR-Pass Filer HWB 685nm\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px; list-style: disc;\"\u003eReduces the effect of seeing resulting in a much sharper image.\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px; list-style: disc;\"\u003eTip for use: Ideal for imaging and used for the luminosity channel.\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px; list-style: disc;\"\u003eThe effect of use: The normal spectral bandwidth is 400-700nm. This filter starts at 670nm in the deep red, just in the visual range so it can be focussed correctly. At this long-wavelength spectral range the atmospheric air turbulence (seeing) has much lower impact on the sharpness. Dark structures on Mars, Jupiter the Moon and the Sun are thereby rendered much sharper. The luminosity can then be combined with RGB creating a very sharp LRGB image.\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px; list-style: disc;\"\u003eHighly recommended for any planetary imager.\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px; list-style: disc;\"\u003eReflex free anti-reflective and optically polished.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44013519536239,"sku":"FIRP-1","price":131.24,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/baader-ir-pass-filter-685-nm-877__94635.jpg?v=1766554564"},{"product_id":"baader-ir-pass-filter-2-685-nm","title":"Baader IR-Pass Filter 2\" (685 nm)","description":"\u003cul style=\"box-sizing: border-box; margin: 0px 0px 1em 1em; padding: 0px; list-style-position: initial; list-style-image: initial; font-family: \" open sans sans-serif rgb color:=\"\" font-size:=\"\" background-color:=\"\"\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px; list-style: disc;\"\u003eBaader IR-Pass Filer HWB 685nm\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px; list-style: disc;\"\u003eReduces the effect of seeing resulting in a much sharper image.\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px; list-style: disc;\"\u003eTip for use: Ideal for imaging and used for the luminosity channel.\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px; list-style: disc;\"\u003eThe effect of use: The normal spectral bandwidth is 400-700nm. This filter starts at 670nm in the deep red, just in the visual range so it can be focussed correctly. At this long-wavelength spectral range the atmospheric air turbulence (seeing) has much lower impact on the sharpness. Dark structures on Mars, Jupiter the Moon and the Sun are thereby rendered much sharper. The luminosity can then be combined with RGB creating a very sharp LRGB image.\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px; list-style: disc;\"\u003eHighly recommended for any planetary imager.\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px; list-style: disc;\"\u003eReflex free anti-reflective and optically polished.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44013520650351,"sku":"FIRP-2","price":209.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/baader-ir-pass-filter-685-nm-877__01203.jpg?v=1766554570"},{"product_id":"optolong-uv-ir-cut-filter-2-mounted","title":"Optolong UV-IR Cut Filter - 2\" Mounted","description":"\u003ccenter style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\u003ch2 style=\"box-sizing: border-box; margin: 0px 0px 16px; line-height: 1.5; font-size: 24px; text-align: left;\"\u003eOptolong UV-IR Cut Filter - 2”\u003c\/h2\u003e\u003c\/center\u003e\u003cp style=\"box-sizing: border-box; padding: 0px; margin: 0px 0px 16px; font-family: Lato, sans-serif; line-height: 1.5; font-size: 16px; transition: none 0s ease 0s;\"\u003eImprove image sharpness with the addition of an Optolong UV-IR Cut Filter, which blocks Ultraviolet and Infrared transmissions but lets the visible spectral region shine through. The IR (700nm to 1100nm) and UV (300nm - 400nm) part of the spectrum are invisible to human eyes, but not to most CCD and other digital cameras, which are sensitive to 300nm to 1100nm. With the Optolong UV-IR Cut filter installed, violet halos and an overall soft image are a thing of the past. This filter also reflects heat radiation and provides great protection against dust.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; padding: 0px; margin: 0px 0px 16px; font-family: Lato, sans-serif; line-height: 1.5; font-size: 16px; transition: none 0s ease 0s;\"\u003eThe Optolong 2” UV-IR Cut 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. Each 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 45mm.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; padding: 0px; margin: 0px 0px 16px; font-family: Lato, sans-serif; line-height: 1.5; font-size: 16px; transition: none 0s ease 0s;\"\u003e\u003cspan style=\"box-sizing: border-box; font-weight: bolder;\"\u003eQuality Filter Materials:\u003c\/span\u003e\u003c\/p\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\n\u003cli style=\"box-sizing: border-box;\"\u003eSchott B260 substrate material from Germany, 2.0mm thick\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box;\"\u003eCNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box;\"\u003eMultiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"box-sizing: border-box; padding: 0px; margin: 0px 0px 16px; font-family: Lato, sans-serif; line-height: 1.5; font-size: 16px; transition: none 0s ease 0s;\"\u003e\u003cspan style=\"box-sizing: border-box; font-weight: bolder;\"\u003eOptolong Filter Manufacturing Processes and Parameters\u003c\/span\u003e\u003c\/p\u003e\u003cul style=\"box-sizing: border-box; font-family: Lato, sans-serif; font-size: 16px;\"\u003e\n\u003cli style=\"box-sizing: border-box;\"\u003eFilter substrate is fine-optically polished to 1\/4 wave and \u0026lt;30 parallelism over both surfaces\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box;\"\u003eSurface quality, according to MIL-O-13830, is 60\/40\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box;\"\u003e95% transmission at visible spectral region 420-680nm highly passing the major nebula emission lines of H-Alpha 656nm, SII 672nm and NII 654nm and 658nm\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box;\"\u003eUltraviolet 300-400nm and infrared wavelength 700-1100nm cut-off\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box;\"\u003eOptolong’s planetary rotation system is a homogenous and precise coating procedure that ensures both high transmission of pass-band and optical density of off-band\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box;\"\u003eThin metal cells have a clear aperture of 45mm for 2” filters\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box;\"\u003eEach filter comes with a plastic case with high pressure EVA case lining\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"box-sizing: border-box; padding: 0px; margin: 0px 0px 16px; font-family: Lato, sans-serif; line-height: 1.5; font-size: 16px; transition: none 0s ease 0s;\"\u003e\u003cspan style=\"box-sizing: border-box; font-weight: bolder;\"\u003eAbout Optolong\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; padding: 0px; margin: 0px 0px 16px; font-family: Lato, sans-serif; line-height: 1.5; font-size: 16px; transition: none 0s ease 0s;\"\u003eOptolong is the Astronomy Filters division of Yulong Optics, an optical filter design and processing company out of Kunming, China that has provided filters for over 700 optical companies since 1999. All Optolong filters pass European Union RoHS requirements and have been certified by TUV Rheinland and Bureau Veritas.\u003c\/p\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44013623509103,"sku":"O-UVIR-2","price":99.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/uvir_cut_125_and_200_1__51446.jpg?v=1766557849"},{"product_id":"s-series-ir850nm-1-25-ir-pass-filter","title":"S-series IR850nm 1.25\" IR-Pass Filter","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Player One Astronomy S-series IR850nm 1.25″ is a deep near-infrared long-pass filter that admits light beyond 850 nm and blocks the visible band to OD3. Its cut-on sits further into the infrared than the IR685, pushing even harder against atmospheric turbulence for the steadiest possible planetary and lunar detail when seeing is rough. It transmits about 90% in-band on a multi-layer coated optical-glass substrate.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis filter is for high-resolution planetary and lunar imagers running an infrared-sensitive monochrome camera who want the deepest practical IR cut for turbulent nights. If you image the Moon or planets such as Mars and want a stronger seeing-buster than a 685 nm filter, or you experiment with infrared views of Uranus, the IR850 is built for it.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e850 nm long-pass:\u003c\/strong\u003e transmits deep near-infrared beyond 850 nm, where seeing has even less effect than at 685 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisible blocking to OD3:\u003c\/strong\u003e rejects shorter wavelengths so only the deep near-IR reaches the sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e≈90% in-band transmission:\u003c\/strong\u003e preserves as much of the available IR signal as possible.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-layer composite coating:\u003c\/strong\u003e on a high-quality optical-glass substrate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ thread (M28.5×0.6):\u003c\/strong\u003e fits standard 1.25-inch cells, drawers, and wheels.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical\/Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe IR850 is a long-pass interference filter with a cut-on near 850 nm: it transmits about 90% above that point and blocks the visible band to optical density 3 (OD3). Pushing the passband deeper into the infrared than a 685 nm filter reduces the effect of atmospheric turbulence further still, at the cost of less available light — deep-IR imaging generally needs a sensitive camera and longer exposures. The 2 mm-thick optical-glass substrate carries a multi-layer composite coating. Mechanically it uses the 1.25-inch M28.5×0.6 thread with a 5 mm body plus 2 mm thread section (7 mm total).\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/IR850-curve-1024x630__42567.jpg?v=1766558511\" alt=\"Player One Astronomy S-series IR850nm 1.25-inch IR-pass filter transmission curve showing the 850nm long-pass edge for deep infrared planetary imaging\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDeep near-infrared planetary and lunar imaging in poor seeing with a sensitive IR camera.\u003c\/li\u003e\n\u003cli\u003eMaximum seeing suppression where a 685 nm filter is not aggressive enough.\u003c\/li\u003e\n\u003cli\u003eInfrared experiments on targets such as Uranus with monochrome cameras.\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 1.25″ M28.5×0.6 filter thread — works in 1.25-inch cells, drawers, and filter wheels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCameras:\u003c\/strong\u003e best with a camera that keeps strong sensitivity out to 850 nm and beyond, typically monochrome.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackfocus:\u003c\/strong\u003e the 7 mm cell and 2 mm glass add to your optical path; include 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\u003eBecause the passband sits deep in the infrared, expect less signal than a 685 nm filter; plan for a sensitive camera and longer exposures.\u003c\/li\u003e\n\u003cli\u003eThis is an imaging filter that passes light your eye cannot see; it is not intended for visual observing.\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\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 1.25-inch filter cell, drawer, or wheel and needs no power or configuration; refocus once after fitting, since deep-IR focus can differ from visible.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the IR685?\u003c\/strong\u003e The IR850 cuts on further into the infrared (850 nm versus 685 nm), so it suppresses seeing more strongly but passes less total light.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need a special camera?\u003c\/strong\u003e Yes, in practice. A camera with good sensitivity beyond 850 nm, usually monochrome, gets usable signal because only deep near-IR passes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e No. It transmits deep near-infrared the eye cannot use; it is an imaging filter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe S-series IR850nm 1.25″ filter pushes imaging deep into the near-infrared beyond 850 nm with ~90% transmission and OD3 visible blocking, giving planetary and lunar imagers the strongest seeing suppression in Player One's IR-pass line.\u003c\/p\u003e","brand":"Player One Astronomy","offers":[{"title":"Default Title","offer_id":44013645955183,"sku":"POA-IR850","price":22.4,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/IR850-1-en__10602.jpg?v=1766558511"},{"product_id":"baader-36mm-clearglass-filter-c-for-focusing-dust-protection","title":"Baader 36mm Clearglass Filter (C) for focusing \/ dust protection","description":"\u003cul style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin-top: 0.9375rem; margin-bottom: 0px; color: rgb(76, 81, 84); font-family: \" libre franklin sans-serif font-size:=\"\" padding:=\"\" margin-left:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eBaader Premium grade impermeable RGB-C Clearglass Filters.\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eThe Baader clear glass filters are used to focus a camera when using very narrow band line filters (due to same mechanical thickness).\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eAlternative function: e.g. our Protective Canon EOS T-Ring uses a clear glass filter for dust protection\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eNO halos, NO reflections, NO ghosting\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eNon-aging sealed coating edges\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44013745733743,"sku":"FC-RD36","price":84.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FC-RD36__35823.jpg?v=1766561564"},{"product_id":"optolong-ir-pass-685nm-2","title":"Optolong IR Pass 685nm 2\"","description":"\u003cspan style=\"font-family: Arial; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003eIR Pass 685nm filter is designed to block wavelengths below 670nm 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.\u003c\/span\u003e\u003cdiv\u003e\u003cspan style=\"font-family: \" microsoft yahei font-size: background-color: rgb\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-size: 18px;\"\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;\"\u003eIR Pass685 Introduction\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-size: 10pt;\"\u003eOptolong IR Pass 685nm filter is designed to block wavelengths below 670nm 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.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-size: 10pt;\"\u003eThe sensor of CCD or CMOS cameras is capable of detecting light in the 350-1100nm range including infrared wavelengths. Thus RGB planetary images taken with IR as the luminance channel have visible-enhanced contrast and surface detail than standard LRGB images.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb\u003e \u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\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;\"\u003eIR Pass685 Spectrum and Characteristic\u003c\/strong\u003e\u003c\/span\u003e\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eSbustrate: B270\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eThickness: 1.85mm\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eTave:  T\u0026gt;90%\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eBlocking range: 350-1050nm\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eBlcoking depth: light pollution  line blocking \u0026gt;99%\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eSurface quality: 60\/40\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eTransmitted Wavefront RMS: ?\/4\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e Parallelism: 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb\u003e \u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb text-align: center\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f38d04404d461d5c64dd2159dc025330_870265cc-86e5-4418-ac58-9f2f8e31a542.png?v=1766562599\" style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; border: none; vertical-align: middle; max-width: 100%; height: 346px; width: 631px;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44013783056495,"sku":"IR 685-2","price":164.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/O-IR685__59774.jpg?v=1766562601"},{"product_id":"optolong-ir-pass-685nm-1-25","title":"Optolong IR Pass 685nm 1.25\"","description":"\u003cspan style=\"font-family: Arial; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003eIR Pass 685nm filter is designed to block wavelengths below 670nm 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.\u003c\/span\u003e\u003cdiv\u003e\u003cspan style=\"font-family: \" microsoft yahei font-size: background-color: rgb\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-size: 18px;\"\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;\"\u003eIR Pass685 Introduction\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-size: 10pt;\"\u003eOptolong IR Pass 685nm filter is designed to block wavelengths below 670nm 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.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-size: 10pt;\"\u003eThe sensor of CCD or CMOS cameras is capable of detecting light in the 350-1100nm range including infrared wavelengths. Thus RGB planetary images taken with IR as the luminance channel have visible-enhanced contrast and surface detail than standard LRGB images.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb\u003e \u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\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;\"\u003eIR Pass685 Spectrum and Characteristic\u003c\/strong\u003e\u003c\/span\u003e\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eSbustrate: B270\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eThickness: 1.85mm\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eTave:  T\u0026gt;90%\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eBlocking range: 350-1050nm\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eBlcoking depth: light pollution  line blocking \u0026gt;99%\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eSurface quality: 60\/40\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003eTransmitted Wavefront RMS: 1\/4\u003cbr style=\"overflow-wrap: break-word; margin: 0px; padding: 0px;\"\u003e Parallelism: 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb\u003e \u003c\/p\u003e\n\u003cp style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: \" microsoft yahei font-size: background-color: rgb text-align: center\u003e\u003cspan style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; font-family: Arial, Helvetica, sans-serif;\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f38d04404d461d5c64dd2159dc025330_0c1ef099-a786-47d0-bc0e-8c33b2ad0042.png?v=1766562607\" style=\"overflow-wrap: break-word; margin: 0px; padding: 0px; border: none; vertical-align: middle; max-width: 100%; height: 346px; width: 631px;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Optolong Filters","offers":[{"title":"Default Title","offer_id":44013783187567,"sku":"IR 685-1","price":109.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/O-IR685__87378.jpg?v=1766562609"},{"product_id":"player-one-astronomy-2-uvir-antihalo-filter","title":"Player One Astronomy 2\" UVIR Antihalo filter","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Player One Astronomy Anti-Halo 2″ UV IR-CUT filter restricts your camera to the visible band, blocking the ultraviolet and infrared light that would otherwise bloat stars and soften planetary and lunar detail. The anti-halo coating adds reflection control on top, so bright targets stay clean instead of picking up glow rings. It transmits more than 95% of visible light while holding out-of-band blocking to OD4.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis filter suits imagers using refractors and other optics where uncorrected UV and IR light spreads the focus and degrades sharpness. If you shoot planets, the Moon, or luminance frames with a colour or mono camera and want tight, true-colour results, 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\u003eUV and IR rejection:\u003c\/strong\u003e confines light to the visible band so stars focus to a tight point and planetary contrast improves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh visible transmission:\u003c\/strong\u003e ≥95% throughput preserves brightness and true colour.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOD4 out-of-band blocking:\u003c\/strong\u003e suppresses the UV and IR wings that a bare sensor would otherwise record.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-halo coating:\u003c\/strong\u003e reduces the reflection halos that can form around bright stars and planets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 2″ format:\u003c\/strong\u003e threads into any standard 2-inch 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\u003eAs a UV IR-CUT filter, it passes the visible band at high efficiency (≥95% transmittance) while rejecting ultraviolet and infrared light to optical density 4 (OD4). Removing those out-of-band wavelengths matters because most refractors are not colour-corrected in the UV and IR, so leaving them in spreads the focus and enlarges star images; cutting them tightens focus and lifts planetary and lunar contrast. Mechanically it is a 2-inch threaded filter with a 5 mm body plus a 2.5 mm thread section (7.5 mm total) and 1.85 mm-thick optical glass, so account for it in your backfocus budget.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Anti-Halo-2-inch-UV-IR-CUT-filter-Curve_372e7423-11da-4cda-8eb7-7980ff4f9642.jpg?v=1784237418\" alt=\"Player One Astronomy Anti-Halo 2-inch UV IR-CUT filter transmission curve showing the visible passband with UV and IR blocking\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePlanetary and lunar imaging with colour or monochrome cameras on refractors.\u003c\/li\u003e\n\u003cli\u003eLuminance capture where UV\/IR bloat would otherwise soften stars.\u003c\/li\u003e\n\u003cli\u003eGeneral visible-band imaging that benefits from tight focus and true colour.\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, wheels, and threaded nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCameras:\u003c\/strong\u003e pairs with 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; include 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; it improves sharpness and colour by removing UV and IR, and does not act as a light-pollution or narrowband filter.\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\u003eInserting any filter shifts focus slightly, so refocus after fitting 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 holder, drawer, or wheel and needs no power or configuration; refocus once after it is installed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does a UV IR-CUT filter actually do?\u003c\/strong\u003e It limits the light reaching your sensor to the visible band, cutting the ultraviolet and infrared that most refractors do not focus to the same point, which sharpens stars and boosts planetary and lunar contrast.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the anti-halo version different?\u003c\/strong\u003e The coating stack adds reflection control to suppress the halo rings that can appear around bright stars and planets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it change my colour balance?\u003c\/strong\u003e It preserves true visible colour by removing only the UV and IR wings; more than 95% of visible light passes through.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Anti-Halo 2″ UV IR-CUT filter keeps your imaging inside the visible band with OD4 UV\/IR blocking and better than 95% transmission, giving you tighter stars, cleaner planetary detail, and halo-controlled results on refractor setups.\u003c\/p\u003e","brand":"Player One Astronomy","offers":[{"title":"Default Title","offer_id":44014019281007,"sku":"AH-UV-IRCUT-2","price":58.8,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Anti-Halo-2-inch-UV-IR-CUT-filter__66706.png?v=1766567582"},{"product_id":"altair-astro-premium-2-cls-ccd-filter-with-uvir-block-ar-coating","title":"Altair Astro Premium 2\" CLS-CCD Filter with UVIR Block \u0026 AR Coating","description":"\u003cp\u003e\u003cspan\u003eThe Altair Astro Premium 2\" CLS-CCD Filter is designed for imaging with DSLR, CCD or CMOS cameras however it can be used for visual observation with 6-8\" aperture or larger telescopes.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e2\" filter has 45mm clear aperture to minimise vignetting.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThe Altair Astro CLS-CCD Filter Drastically reduces the effects of light pollution and natural moon or skyglow, permitting long exposure imaging, even in urban conditions. \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eEnhances nebulae with peak transmission of 95% in H 486.1nm; OIII 495.9nm; OIII 500.7nm and H 656.3nm wavelengths.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eArtificial Light Pollution wavelengths are very effectively blocked, the primary ones being: \u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHg 435.8  \u003c\/li\u003e\n\u003cli\u003eHg 546.1nm  \u003c\/li\u003e\n\u003cli\u003eHg 577.0nm  \u003c\/li\u003e\n\u003cli\u003eHg 578.1nm\u003c\/li\u003e\n\u003cli\u003eNa 589.0  \u003c\/li\u003e\n\u003cli\u003eNa 589.6nm  \u003c\/li\u003e\n\u003cli\u003eNa 615.4nm  \u003c\/li\u003e\n\u003cli\u003eNa 616.1nm \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAside from the high qualty Schott German glass and top quality coatings, these filters have some additional enhancements which make them ideal for your astro imaging application.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAdvanced UV\/IR blocking give small star sizes even with refractor optics, and AR (Anti Reflection) coatings reduce halo effects and internal reflections for more pleasing star images.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCan be used visually on 250mm or larger aperture telescopes for very high contrast. (Do not use for Sun!).\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003ePremium filter features:\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMulti-Layer Anti-Reflection coating to reduce star-halos and reflections from camera optical window.\u003c\/li\u003e\n\u003cli\u003eBatch-tested for consistency.\u003c\/li\u003e\n\u003cli\u003eUltra-flat glass by Schott Germany. 1.85mm Glass 30sec parallel, optical polish to MIL Spec. MIL-O-13830.\u003c\/li\u003e\n\u003cli\u003eHigh quality dichroic\/dielectric coatings. Electron-beam gun evaporation with 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\/li\u003e\n\u003cli\u003eUV\/IR block for imaging - star bloat reduction with refractors.\u003c\/li\u003e\n\u003cli\u003ePrecision CNC machined filter cell for strain-free mounting and freedom from tilt.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ontario Telescope and Accessories","offers":[{"title":"Default Title","offer_id":44038681264239,"sku":"F200CLSCCD","price":109.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/altair-astro-premium-2-cls-ccd-filter-with-uvir-block-ar-coating-317-p__07974.jpg?v=1767595390"},{"product_id":"altair-astro-premium-1-25-cls-ccd-filter-with-uvir-block-ar-coating","title":"Altair Astro Premium 1.25\" CLS-CCD Filter with UVIR Block \u0026 AR Coating","description":"\u003cp\u003e\u003cspan\u003eThe Altair Astro Premium 1.25\" CLS-CCD Filter is designed for imaging with DSLR, CCD or CMOS cameras however it can be used for visual observation with 6-8\" aperture or larger telescopes.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThis 1.25\" filter has 26mm clear aperture to minimise vignetting.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThe Altair Astro CLS-CCD Filter Drastically reduces the effects of light pollution and natural moon or skyglow, permitting long exposure imaging, even in urban conditions. \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eEnhances nebulae with peak transmission of 95% in H 486.1nm; OIII 495.9nm; OIII 500.7nm and H 656.3nm wavelengths.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eArtificial Light Pollution wavelengths are very effectively blocked, the primary ones being: \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHg 435.8  \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHg 546.1nm  \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHg 577.0nm  \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHg 578.1nm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eNa 589.0  \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eNa 589.6nm  \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eNa 615.4nm  \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eNa 616.1nm \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAside from the high qualty Schott German glass and top quality coatings, these filters have some additional enhancements which make them ideal for your astro imaging application.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAdvanced UV\/IR blocking give small star sizes even with refractor optics, and AR (Anti Reflection) coatings reduce halo effects and internal reflections for more pleasing star images.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCan be used visually on 250mm or larger aperture telescopes for very high contrast. (Do not use for Sun!).\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003ePremium filter features:\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMulti-Layer Anti-Reflection coating to reduce star-halos and reflections from camera optical window.\u003c\/li\u003e\n\u003cli\u003eBatch-tested for consistency.\u003c\/li\u003e\n\u003cli\u003eUltra-flat glass by Schott Germany. 1.85mm Glass 30sec parallel, optical polish to MIL Spec. MIL-O-13830.\u003c\/li\u003e\n\u003cli\u003eHigh quality dichroic\/dielectric coatings. Electron-beam gun evaporation with 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\/li\u003e\n\u003cli\u003eUV\/IR block for imaging - star bloat reduction with refractors.\u003c\/li\u003e\n\u003cli\u003ePrecision CNC machined filter cell for strain-free mounting and freedom from tilt.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ontario Telescope and Accessories","offers":[{"title":"Default Title","offer_id":44038681297007,"sku":"F125PCLSCCD","price":69.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/altair-astro-premium-1.25-cls-ccd-filter-with-uvir-block-ar-coating-313-p__24176.jpg?v=1767595395"}],"url":"https:\/\/ontariotelescope.com\/collections\/uv-ir-filters.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}