{"product_id":"svbony-2-uhc-light-pollution-filter","title":"SVBONY 2″ UHC Light Pollution Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6368834932617211706668990_2b7a8944-e92a-4f39-80d0-0698ee7d0c81.jpg?v=1791670033\" alt=\"SVBONY 2″ UHC light pollution filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is the 2″ version of the SVBONY UHC (Ultra High Contrast) light pollution filter. A UHC filter has a narrower passband than a broadband CLS filter: it reduces light from mercury-vapour and sodium-vapour street lamps and the natural oxygen airglow of the atmosphere while passing the emission lines of nebulae. The sky background turns darker and emission and planetary nebulae gain contrast. SVBONY builds it with an optical glass element in an aluminium frame and supplies it in a transparent storage case.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe or image emission nebulae from urban or suburban skies with a 2″ diagonal, 2″ eyepieces or a 2″ imaging train, and want the background darkened more than a broadband filter would manage.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9131b-1_20250807111141_9843--1-_20260810104404_3573.webp?v=1791670034\" alt=\"SVBONY F9131B 2″ UHC light pollution filter for nebula observing and imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-high contrast passband:\u003c\/strong\u003e selectively reduces artificial-light wavelengths so emission nebulae stand out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDarker background:\u003c\/strong\u003e SVBONY rates the background darker and nebula contrast higher than with typical broadband filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical glass in an aluminium frame:\u003c\/strong\u003e built for frequent use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ format:\u003c\/strong\u003e for low-power, wide-field eyepieces and larger imaging sensors where a 1.25″ filter would vignette.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029079471920178388140_c205687b-ed74-4a3e-a2a8-22d92ed9b066.jpg?v=1791670033\" alt=\"SVBONY 2″ UHC filter nebula contrast and light pollution blocking panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field visual observing of emission nebulae:\u003c\/strong\u003e the Veil, North America and Orion nebulae through 2″ low-power eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary nebulae:\u003c\/strong\u003e improved contrast on the Ring, Dumbbell and Helix.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour imaging under bright skies:\u003c\/strong\u003e emission targets through a 2″ nosepiece or filter drawer.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20260304091845_2351_df631f57-2432-4dc6-88b1-1552397b3ffc.webp?v=1791670034\" alt=\"SVBONY 2″ UHC light pollution filter for emission nebula observing and imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2_20260304091847_9948_2ead0446-5acc-4522-ad74-697a42a61181.webp?v=1791670034\" alt=\"SVBONY 2″ UHC light pollution filter for emission nebula observing and imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit:\u003c\/strong\u003e threads into the filter thread of 2″ eyepieces, diagonals, nosepieces and filter drawers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ trains:\u003c\/strong\u003e SVBONY makes the same filter in 1.25″ (F9131A), which we also list.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUHC vs CLS:\u003c\/strong\u003e the UHC suits brighter skies; SVBONY's CLS is the wider-band option for moderately dark sites.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/3_20260304091850_2188_58b0a4b5-efef-4fbc-8f5f-fb9b3359527c.webp?v=1791670034\" alt=\"SVBONY 2″ UHC light pollution filter for emission nebula observing and imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest on emission objects:\u003c\/strong\u003e galaxies and star clusters are broadband targets and gain little from a UHC filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimmer stars and colour shift:\u003c\/strong\u003e the narrower passband dims stars visually and gives images a colour cast that is corrected in processing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for this filter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It threads by hand into the filter thread of a 2″ eyepiece, diagonal or nosepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it for visual use or imaging?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBoth. SVBONY presents it for visual observing and astrophotography.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I choose 2″ or 1.25″?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eChoose 2″ if you use 2″ eyepieces or a 2″ diagonal, or image with a sensor large enough that a 1.25″ filter would vignette.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″ UHC filter that darkens light-polluted skies and lifts emission and planetary nebulae, for wide-field visual observing and 2″ imaging trains.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"2″","offer_id":67722207789167,"sku":"F9131B","price":61.28,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9131b-1_20250807111141_9843--1-_20260810104404_3573.webp?v=1791670034","url":"https:\/\/ontariotelescope.com\/products\/svbony-2-uhc-light-pollution-filter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}