{"product_id":"optolong-uhc-light-pollution-filter","title":"Optolong UHC Light Pollution Filter","description":"\u003ch2\u003eOptolong UHC Light Pollution Filter\u003c\/h2\u003e\n\u003cp\u003eThe UHC (Ultra High Contrast) broadband filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high \u0026amp; low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution.\u003c\/p\u003e\n\u003cp\u003eMain Use and Performance\u003c\/p\u003e\n\u003cp\u003eSuitable for color CCD cameras and unmodified DSLRs.\u003c\/p\u003e\n\u003cp\u003eUHC with narrower passband provides higher contrast than CLS. Thus it is more suitable for urban environment where you suffer from severe light pollution.\u003c\/p\u003e\n\u003cp\u003eUHC has a substantial red passband and offer superb views for objects like the Orion Nebula (M42).\u003c\/p\u003e\n\u003cp\u003eLight pollution filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/p\u003e\n\u003cp\u003eWARNING: The filters of Optolong are not designed for sun observation.\u003cspan\u003e \u003c\/span\u003e\u003cem\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH OPTOLONG FILTER\u003c\/strong\u003e\u003c\/em\u003e. You would be BLIND if you fail to observe the warning.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eSubstrate: optical glass\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTave\u0026gt;95%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlocking range: 300-700nm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlcoking depth: OD3, light pollution line blocking \u0026gt;99%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSurface quality: 60\/40 (Refer to MIL-O-13830A, MIL-C-48497A)\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTransmitted Wavefront RMS:  ¼ λ\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eParallelism: 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Year Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":43697824891109,"sku":"OL-UHC-1.25","price":77.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":43697824923877,"sku":"OL-UHC-2","price":119.0,"currency_code":"CAD","in_stock":true},{"title":"M77 Mounted","offer_id":43697824956645,"sku":"OL-UHC-77","price":265.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS-C Clip","offer_id":43697824989413,"sku":"OL-UHC-EOS-C","price":133.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS FF Clip","offer_id":43697825022181,"sku":"OL-UHC-EOS-FF","price":161.0,"currency_code":"CAD","in_stock":true},{"title":"Nikon FF Clip","offer_id":43697825054949,"sku":"OL-UHC-NK-FF","price":161.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-uhc-light-pollution-filter-astronomy-plus_fbccad76-0732-4a71-aef7-04134f1b4a9c.jpg?v=1690487282","url":"https:\/\/istronomyplus.com\/products\/optolong-uhc-light-pollution-filter","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}