{"product_id":"used-vaonis-vespera-light-pollution-cls-filter-1","title":"Used Vaonis Vespera Light Pollution (CLS) Filter","description":"\u003cp\u003eThis is a returned Vespera light pollution filter in excellent, clean condition.  The only reason we're not listing this as an Open Box is because the previous owner etched \"Light Pollution\" into the plastic jewel box.  Otherwise, the filter itself is practically untouched.  Save \u003cstrong\u003eFIFTY BUCKS\u003c\/strong\u003e off of a brand new one!  \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAny dust you may see in the photos is removable - it seems that these filters develop an electrostatic charge such that the dust in the air is just attracted to the filter.  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eIt comes in the etched jewel case and its original box.  \u003c\/p\u003e\n\u003cp\u003e   \u003c\/p\u003e\n\u003cp\u003e   \u003c\/p\u003e\n\u003cp\u003e   \u003c\/p\u003e\n\u003cp\u003eThe Vespera light pollution filter or CLS (City Light Suppression) filter allows you to improve the quality of your photos when observing in the city or suburbs. It attenuates the effects of light pollution and thus increases the contrast between the celestial object being photographed and the background sky.\u003c\/p\u003e\n\u003cp\u003eThe broadband filter blocks wavelengths mainly emitted by urban night lighting or undesirable natural light, while allowing the main wavelengths from celestial objects.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEssential for observing from an environment where light pollution is very present (urban and peri-urban environment, residential lighting, etc.)\u003c\/li\u003e\n\u003cli\u003eImproves the quality of nebula photography\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Vespera light pollution filter or CLS (City Light Suppression) filter allows you to improve the quality of your photos when observing in the city or suburbs. It attenuates the effects of light pollution and thus increases the contrast between the celestial object being photographed and the background sky.\u003c\/p\u003e\n\u003cp\u003e \u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003ch2\u003eDescription\u003c\/h2\u003e\n\u003cp\u003eThe Vespera light pollution filter or CLS (City Light Suppression) filter allows you to improve the quality of your photos when observing in the city or suburbs. It attenuates the effects of light pollution and thus increases the contrast between the celestial object being photographed and the background sky.\u003c\/p\u003e\n\u003cp\u003eThe broadband filter blocks Na (sodium) and Hg (mercury) wavelengths mainly emitted by urban night lighting or undesirable natural light (atmospheric oxygen radiation, etc.), while allowing the main wavelengths from celestial objects.\u003c\/p\u003e\n\u003cp\u003eThe anti-light pollution filter is particularly useful for improving the brightness of deep sky objects: nebulae, star clusters, galaxies, etc. It is especially effective on emission nebulae because of the filtered wavelengths.\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003eExamples of emission nebulae\u003c\/u\u003e: Bubble (NGC 7635), Crescent (NGC 6888), Eagle (M16), Elephant’s Trunk (IC 1396), Flame (NGC 2024), Lagoon (M8), North America (NGC 7000), Omega (M17), Orion (M42), Pacman (NGC 281), Rosette (NGC 2237), Tarantula (NGC 2070), Thor’s Helmet (NGC 2359), Trifid (M20), Tulip (Sh2-101).\u003c\/p\u003e\n\u003cp\u003eDesigned specifically for the Vespera lens, it fits easily and discreetly into the optical arm. The lens ring that holds the CLS filter is equipped with an electronic card that allows Vespera to detect it.\u003c\/p\u003e\n\u003cp\u003eThe filter is delivered in a transparent storage box.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransmission curve\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca class=\"swipebox\" title=\"\" data-rl_caption=\"\" data-rl_title=\"\" data-rel=\"lightbox-image-0\" href=\"https:\/\/vaonis.com\/wp-content\/uploads\/2022\/07\/Courbe-filtre-cls.png\"\u003e\u003cimg height=\"300\" width=\"777\" alt=\"Vespera light pollution filter transmission curve\" src=\"https:\/\/vaonis.com\/wp-content\/uploads\/2022\/07\/Courbe-filtre-cls.png\" class=\"alignnone wp-image-24263 size-full\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Vaonis","offers":[{"title":"Default Title","offer_id":48696004542723,"sku":"U2606-XXX-AC023","price":180.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/443dd29a-54b4-4f0d-a6e2-b6c511837a7d.jpg?v=1782584815","url":"https:\/\/milehighastro.com\/products\/used-vaonis-vespera-light-pollution-cls-filter-1","provider":"Mile High Astronomy","version":"1.0","type":"link"}