{"title":"Celestron Light Pollution Filters","description":"\u003cp\u003eCelestron's range includes the 1.25\" UHC and 2\" UHC\/LPR filters for nebula observing through light-polluted skies. For imaging, Celestron makes dedicated light pollution filters for its RASA astrographs, including a version for the RASA 8. Part of \u003ca href=\"\/collections\/light-pollution-filters\"\u003eLight Pollution \u0026amp; Broadband Filters\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"uhc-lpr-filter-2-in","title":"UHC\/LPR FILTER - 2 IN","description":"\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eOur 2\" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes 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. sky glow).\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe new ultra high contrast (UHC) LPR filter has improved contrast over the typical broadband filters. Sky background is darker, and contrast of emission nebulae are noticeably improved. The advanced technology coatings enable the filter to achieve an outstanding transmission of over 97% across the entire bandpass, with total blockage of prominent light pollution lines. The perfect filter for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eIn addition to it's optimum spectral and optical characteristics, the UHC\/LPR filter offers important features that set it apart and result in the highest quality celestial views:\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe multi-layer dielectric coatings are plasma assisted and Ionbeam hardened using the latest technology for durability and resistance to scratching.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eImproved transmission translates to maximum image brightness and contrast. Users of smaller, 4\"-11\" telescopes will especially appreciate the high efficiency, and larger scope users will love the rich star fields and detailed subtle nebular shadings that are left intact. \u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe high transmission, sharp cutoffs, and more moderate 60nm passband of the UHC\/LPR filter retains a more natural view, yet significantly boosts overall contrast. Imagers will appreciate the broader bandpass and inclusion of an extremely efficient H-Alpha passband (656nm).\u003c\/span\u003e\u003c\/div\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44013342064751,"sku":"94124","price":173.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/94124_2-inch_filter_01__94735.jpg?v=1766550843"},{"product_id":"1-25-uhc-filter","title":"1.25\" UHC 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  \u003cp\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:\" arial\u003eOur 1-1\/4\" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengt...\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\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\u003eOur 1-1\/4\" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes 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. sky glow).\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:\" arial\u003eThe new ultra high contrast (UHC) LPR filter has improved contrast over the typical broadband filters. Sky background is darker, and contrast of emission nebulae are noticeably improved. The advanced technology coatings enable the filter to achieve an outstanding transmission of over 97% across the entire bandpass, with total blockage of prominent light pollution lines. The perfect filter for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:\" arial\u003eIn addition to it's optimum spectral and optical characteristics, the UHC\/LPR filter offers important features that set it apart and result in the highest quality celestial views:\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:\" arial\u003eThe multi-layer dielectric coatings are plasma assisted and Ionbeam hardened using the latest technology for durability and resistance to scratching.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:\" arial\u003eImproved transmission translates to maximum image brightness and contrast. Users of smaller, 4\"-11\" telescopes will especially appreciate the high efficiency, and larger scope users will love the rich star fields and detailed subtle nebular shadings that are left intact. \u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp\u003e\u003cspan style=\"font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:\" arial\u003eThe high transmission, sharp cutoffs, and more moderate 60nm passband of the UHC\/LPR filter retains a more natural view, yet significantly boosts overall contrast. Imagers will appreciate the broader bandpass and inclusion of an extremely efficient H-Alpha passband (656nm).\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44013369098351,"sku":"94123","price":131.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/94123_UHC-LPR__252520Filter_1-25_1__67613.1682640001.1280.1280.jpg?v=1766551558"},{"product_id":"light-polution-imaging-filter-for-rasa","title":"Light Polution Imaging filter for RASA","description":"\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:12.0pt;mso-bidi-font-size:11.0pt; line-height:107%;font-family:\" arial\u003eTake beautiful images of deep-sky objects from light-polluted suburban locations with the Rowe-Ackermann Schmidt Astrograph (RASA) using this all-new light pollution suppression filter designed by Celestron and Astrodon, the leading astroimaging filter company.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:12.0pt;mso-bidi-font-size:11.0pt; line-height:107%;font-family:\" arial\u003eCustom fit to drop into RASA s optical window, so you get optimum optical performance even with the addition of the filter.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:12.0pt;mso-bidi-font-size:11.0pt; line-height:107%;font-family:\" arial\u003eSelectively removes unwanted light pollution while allowing more overall light transmission to pass through to the sensor. Provides over 90% transmission at critical wavelengths.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:12.0pt;mso-bidi-font-size:11.0pt; line-height:107%;font-family:\" arial\u003eMaintains a more neutral color balance than other light pollution imaging filters, perfect for imaging colorful nebulae and galaxies.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:12.0pt;mso-bidi-font-size:11.0pt; line-height:107%;font-family:\" arial\u003eEvery filter is individually tested for light transmission. A graph of test results for your specific filter is included for your reference a valuable service unique to Astrodon.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 24pt; line-height: 107%; font-family: Arial, sans-serif; text-transform: uppercase; font-weight: bold;\"\u003eDESCRIPTION\u003c\/span\u003e\u003cspan style=\"font-size:24.0pt;mso-bidi-font-size:22.5pt;line-height:107%;font-family: \" arial\u003e\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"box-sizing: border-box\"\u003e\u003cspan style=\"font-size:12.0pt; mso-bidi-font-size:11.0pt;line-height:107%;font-family:\" arial\u003e\u003c\/span\u003eGet the most out of your Celestron Rowe-Ackermann Schmidt Astrograph, even under light-polluted skies, with this Light Pollution Imaging Filter, custom-designed for RASA by Celestron and Astrodon.\u003cbr style=\"box-sizing: border-box\"\u003e \u003cbr style=\"box-sizing: border-box\"\u003e No matter which camera you use, this filter s generous 72 mm diameter allows it to easily accommodate today s largest sensors.\u003cbr style=\"box-sizing: border-box\"\u003e \u003cbr style=\"box-sizing: border-box\"\u003e \u003cstrong style=\"box-sizing: border-box\"\u003e\u003cspan style=\"font-size:12.0pt; mso-bidi-font-size:13.5pt;line-height:107%;font-family:\" arial color:\u003eCELESTRON S OPTICAL DESIGN, ENHANCED BY ASTRODON\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-size:12.0pt; mso-bidi-font-size:11.0pt;line-height:107%;font-family:\" arial\u003e\u003cbr style=\"box-sizing: border-box\"\u003e Astrodon, the world s leading imaging filter company, collaborated with Celestron engineers to create a filter for the Rowe-Ackermann Schmidt Astrograph. The result is the best light pollution suppression filter for astroimaging. The filter replaces a piece of placeholder glass in the optical path, so that RASA s precise optical path is unaltered.\u003cbr style=\"box-sizing: border-box\"\u003e \u003cbr style=\"box-sizing: border-box\"\u003e \u003c\/span\u003e\u003cstrong style=\"box-sizing: border-box\"\u003e\u003cspan style=\"font-size:12.0pt; mso-bidi-font-size:13.5pt;line-height:107%;font-family:\" arial color:\u003eREMOVE LIGHT POLLUTION WHILE KEEPING YOUR IMAGES BRIGHT\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-size:12.0pt;mso-bidi-font-size:11.0pt;line-height:107%;font-family: \" arial\u003e\u003cbr style=\"box-sizing: border-box\"\u003e Light pollution limits how much of the night sky we can see and photograph.  When imaging with a color camera in light polluted areas, skyglow degrades image quality. Light pollution filters help to selectively block light emitted from common streetlights and other ambient lighting.  But most light pollution filters greatly compromise the total light throughput, causing dim images, and negatively impact the color balance, causing images to appear too green or blue.\u003cbr style=\"box-sizing: border-box\"\u003e \u003cbr style=\"box-sizing: border-box\"\u003e The Light Pollution Imaging Filter for RASA  surgically  removes unwanted light pollution while preserving as much of the useful spectrum as possible. That means you ll still retain over 90 percent of the light captured by your telescope at many wavelengths.\u003cbr style=\"box-sizing: border-box\"\u003e \u003cbr style=\"box-sizing: border-box\"\u003e Unlike other light pollution suppression filters, the new Celestron LP Imaging Filter for RASA maintains a neutral color balance. Dielectric coatings further enhance light transmission, so you can bring out subtle color in galaxies and other faint deep sky objects. Meanwhile, anti-reflective coatings prevent star halos and minimize internal reflections.\u003cbr style=\"box-sizing: border-box\"\u003e \u003cbr style=\"box-sizing: border-box\"\u003e \u003c\/span\u003e\u003cstrong style=\"box-sizing: border-box\"\u003e\u003cspan style=\"font-size:12.0pt; mso-bidi-font-size:13.5pt;line-height:107%;font-family:\" arial color:\u003eINDIVIDUALLY TESTED FOR QUALITY\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-size:12.0pt;mso-bidi-font-size: 11.0pt;line-height:107%;font-family:\" arial\u003e\u003cbr style=\"box-sizing: border-box\"\u003e \u003c\/span\u003e\u003cspan style=\"font-size:12.0pt;mso-bidi-font-size:11.0pt;line-height: 107%;font-family:\" arial\u003eEvery Celestron Light Pollution Imaging Filter is tested individually for light transmission. Inside the box, you ll receive the actual transmission spectrum for your specific filter. Your report is prepared by Astrodon and matched to your filter s serial number, so you have total confidence in your filter s performance.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size:12.0pt;mso-bidi-font-size:11.0pt; line-height:107%;font-family:\" arial\u003e \u003c\/span\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44013376405615,"sku":"93617","price":940.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/93617_LPIF_comparison__10907.jpg?v=1766552169"},{"product_id":"light-pollution-imaging-filter-rasa-8","title":"LIGHT POLLUTION IMAGING FILTER, RASA 8","description":"\u003cp style=\"box-sizing: inherit; margin: 0px 0px 15px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eLight pollution in the night sky can significantly degrade contrast in astronomical images. This is especially true when using very fast telescopes like the 8” RASA because the sky background saturates very quickly. The “noise” of the light pollution overwhelms the “signal” from the celestial object you are imaging, making it difficult to get the most detailed image. The Light Pollution Imaging Filter for the 8” RASA remedies this by blocking light pollution while transmitting light from deep-sky objects. The result is bright, detailed objects that pop off the black sky background with superior contrast.\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px 0px 15px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eFortunately, many sources of light pollution have relatively discreet emission spectra; they emit primarily at specific wavelengths of light. By strategically blocking these wavelengths, the filter greatly reduces the effects of light pollution without degrading overall image quality.\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px 0px 15px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eThe Light Pollution Imaging (LPI) Filter for the 8” RASA blocks light from some of the most common sources of light pollution between 400-700nm (i.e., the visible spectrum), including high- and low-pressure sodium-vapor streetlights, mercury-vapor streetlights, and natural airglow caused by oxygen in the atmosphere. Unlike some light pollution filters, the LPI filter blocks only specific areas of the spectrum instead of wide regions. This helps to maintain image brightness and color balance. In addition, specific wavelengths associated with emission nebulae, such as H-a(656nm), H-ß (486nm), OIII (496nm and 501nm), and SII (672nm), are highly transmitted, ensuring minimal loss of image brightness for those objects.\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px 0px 15px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eThe filter fits directly into the internal filter mount in the RASA 8’s front lens cell, where the optical window normally mounts. By removing the clear window and replacing it with the filter, optical performance for the entire system is maintained.\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eEach filter comes with a plastic storage case to safely store the filter or the placeholder glass that came with your RASA when not in use. You will also receive a spectral transmission graph unique to your specific unit, verifying its performance.\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44013458194543,"sku":"93614","price":390.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/93614_Light_Polution_Filter_RASA_8_01_570x3802x__28642.jpg?v=1766553601"}],"url":"https:\/\/ontariotelescope.com\/collections\/light-pollution-filters-celestron.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}