{"title":"Optolong CLS-CCD Filters for Astrophotography | Dark Clear Skies","description":"\u003ch2\u003eOptolong CLS-CCD Filters\u003c\/h2\u003e\u003cp\u003eCLS filters with IR-cut coating designed specifically for CCD and CMOS cameras.\u003c\/p\u003e","products":[{"product_id":"optolong-cls-ccd-filters","title":"Optolong CLS-CCD Filters","description":"\u003cp data-mce-fragment=\"1\"\u003eThe CLS-CCD 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 photograghic purpose at light pollution area.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cb data-mce-fragment=\"1\"\u003eMain Use and Performance\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCLS-CCD is different from CLS with infrared wavelength 700-1100nm cut-off\u003cbr data-mce-fragment=\"1\"\u003eFit with color CCD cameras and modified DSLRs for astrophotography\u003cbr data-mce-fragment=\"1\"\u003eWork well on most emission nebulae, planetary nebulae and supernova remnants\u003cbr data-mce-fragment=\"1\"\u003eNoticeable boost in contrast and visibility of the fainter outer detail\u003cbr data-mce-fragment=\"1\"\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 data-mce-fragment=\"1\"\u003e\u003cb data-mce-fragment=\"1\"\u003eTechnical Data\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSchott substrate material\u003cbr data-mce-fragment=\"1\"\u003e Thickness 2.0 mm (1.25”\/2”\/36mm)\u003cbr data-mce-fragment=\"1\"\u003eThickness 1.0 mm (Clip series)\u003cbr data-mce-fragment=\"1\"\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003cbr data-mce-fragment=\"1\"\u003eFine-optically polished to ensure accurate 1\/4 wavefront and \u0026lt;30 seconds parallelism over the both surfaces\u003cbr data-mce-fragment=\"1\"\u003e95% transmission of main nebula emission lines (i.e. H-alpha 656nm, OIII 496nm and 500nm, SII 672nm and H-beta 486nm\u003cbr data-mce-fragment=\"1\"\u003e0.1% transmission of off-band, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm). Transmission of 0.1% is equivalent to OD3(Optical Density), and a high optical density value indicates very low transmission, and low optical density indicates high transmission.\u003cbr data-mce-fragment=\"1\"\u003eCoating Parameter\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cb data-mce-fragment=\"1\"\u003eMulti-layers anti-reflection coating\u003c\/b\u003e\u003cbr data-mce-fragment=\"1\"\u003e Non-cementing optical substrate coating\u003cbr data-mce-fragment=\"1\"\u003eElectron-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\u003cbr data-mce-fragment=\"1\"\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band\u003cbr data-mce-fragment=\"1\"\u003eFilter Cell\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e Ultra-thin filter cell minimize vignetting by maximize possible clear aperture (clear aperture is 26mm for 1.25”; 45mm for 2”)\u003cbr data-mce-fragment=\"1\"\u003e Aerometal Material | Precise CNC Machining | Sand Blasting Process | Black Anodized Finish | Extinction Treatment to Prevent Reflection | Laser Engraving No Fading\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":42296189255857,"sku":"","price":64.0,"currency_code":"GBP","in_stock":true},{"title":"2\"","offer_id":42296189288625,"sku":"","price":119.9,"currency_code":"GBP","in_stock":true},{"title":"EOS APS-C","offer_id":42296189321393,"sku":"","price":88.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/optolong-cls-ccd-filters-319685.jpg?v=1718364488"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/collections\/optolong-cls-ccd-filters-for-astrophotography-dark-clear-skies-293728_7487b69d-5087-4084-a4dc-c3bf040e552b.jpg?v=1730873366","url":"https:\/\/www.darkclearskies.co.uk\/collections\/optolong-cls-ccd-filters-for-astrophotography-dark-clear-skies.oembed","provider":"Dark Clear Skies ","version":"1.0","type":"link"}