{"product_id":"astronomik-cls-ccd-light-pollution-filter-clip-in-eos-aps-c-pre-owned","title":"Astronomik CLS CCD Light Pollution Filter Clip-in EOS APS-C (Pre-owned)","description":"\u003cp\u003e\u003cspan style=\"color: rgb(255, 0, 0);\"\u003e\u003cem\u003eUsed filter in good condition.\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"card__header\"\u003e\n\u003cdiv class=\"card__title heading h3\"\u003eDescription\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card__section\"\u003e\n\u003cdiv class=\"rte text--pull\"\u003e\n\u003cp\u003e\u003cstrong\u003eAstronomik CLS CCD filters are suitable under light-polluted skies for DSLR Cameras which have been modified for astronomical use.  For unmodified DSLRs, use \u003ca href=\"https:\/\/telescopescanada.ca\/collections\/no-stock-astronomik\/products\/astronomik-cls-light-pollution-filter?_pos=1\u0026amp;_sid=49a59a5b9\u0026amp;_ss=r\u0026amp;variant=32783012069456\" target=\"_blank\"\u003eAstronomik CLS filters\u003c\/a\u003e.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe filter enhances the contrast between all deep-sky objects and the background.\u003cbr\u003e\u003cbr\u003eThe CLS-CCD Filter enhances the contrast between astronomical objects and the background. Due to the wider transmission curve compared to UHC filters, a greater amount of light will pass the filter. Stars will be less dimmed. This filter has been optimized to block as much spurious light as possible and simultaneously provide the best performance for 'useful' light. A good filter for DSLR-, CCD- and film b\/w-photography as well as observation of deep-sky-objects with telescopes or photo lenses of all aperture f\/3 and above.\u003c\/p\u003e\n\u003ch4\u003eMain use\u003c\/h4\u003e\n\u003cp\u003eThe filter blocks completely emission lines of artificial light sources like streetlights (e.g. sodium- and mercury-vapor) as well as the airglow. All 'important' emission lines as well as the spectral range of the night-adapted eye are being passed. The supplementary IR-blocking layer allows the use for DSLR- and Webcams without an integrated IR-block filter.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eOther uses\u003c\/h4\u003e\n\u003cp\u003eEasier resolution of Double Stars\u003cbr\u003eWith the EOS-Clip model, photography with DSLR cameras is feasible even under extreme light-polluting conditions without shifting the white balance.\u003cbr\u003eThe 1,25\" and 2\" socket models can be used for observations from light-polluted areas.\u003cbr\u003eIf you plan to create color images from emission line data, our CLS-CCD filter is a great choice for the Luminance channel\u003cbr\u003eAlternatives\u003cbr\u003eCLS: For cameras with an integrated IR-filter or for visual observation.\u003c\/p\u003e\n\u003ch4\u003eSuitability\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eVisual observation (dark skies): Good, to reduce light pollution by mercury-vapour lamps (streetlight)\u003c\/li\u003e\n\u003cli\u003eVisual observation (urban skies): Reasonable, an UHC-E or UHC filter is more suitable\u003c\/li\u003e\n\u003cli\u003eFilm photography: Very good, colour balance is near perfect\u003c\/li\u003e\n\u003cli\u003eCCD photography: Very good, optimized rejection of light pollution\u003c\/li\u003e\n\u003cli\u003eDSLR photography (original): Good, colour balance shifted but contrast enhanced\u003c\/li\u003e\n\u003cli\u003eDSLR photography (astro modified): Very good, colour balance is near perfect\u003c\/li\u003e\n\u003cli\u003eDSLR photography (MC modified): Very good, colour balance is near perfect\u003c\/li\u003e\n\u003cli\u003eWebcam \/ Video (Planets): Unsuitable\u003c\/li\u003e\n\u003cli\u003eWebcam \/ Video (Deep Sky): Very good, if light pollution is a big problem\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e95% transmission at 486nm (H-beta)\u003c\/li\u003e\n\u003cli\u003e95% transmission at 496nm (O\u003cspan face=\"Times New Roman, Times, serif\"\u003eIII\u003c\/span\u003e)\u003c\/li\u003e\n\u003cli\u003e95% transmission at 501nm (O\u003cspan face=\"Times New Roman, Times, serif\"\u003eIII\u003c\/span\u003e)\u003c\/li\u003e\n\u003cli\u003e97% transmission at 656nm (H-alpha)\u003c\/li\u003e\n\u003cli\u003epass from 450 to 520nm and from 640 to 690nm\u003c\/li\u003e\n\u003cli\u003eParfocal with other Astronomik filters\u003c\/li\u003e\n\u003cli\u003eGlass thickness: 1mm\u003c\/li\u003e\n\u003cli\u003eCompletely resistant against high humidity, scratches and aging effects\u003c\/li\u003e\n\u003cli\u003eDiffraction limited, the filter will not reduce the optical performance of your telescope!\u003c\/li\u003e\n\u003cli\u003eAstronomik filters are delivered in a high-quality, long lasting, filter box\u003c\/li\u003e\n\u003cli\u003eSince 2008 we do ship filters with a completely new design. Any kind of halo or strange reflection is a matter of past\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41756616097905,"sku":"USED032802","price":89.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/20250328_153243.jpg?v=1776458944","url":"https:\/\/khanscope.com\/fr-fr\/products\/astronomik-cls-ccd-light-pollution-filter-clip-in-eos-aps-c-pre-owned","provider":"Khan Scope Centre","version":"1.0","type":"link"}