{"title":"Astronomik CLS Filters for Clear Sky Observations","description":"\u003ch2\u003eAstronomik CLS Filters\u003c\/h2\u003e\u003cp\u003eAstronomik CLS filters reduce light pollution and improve contrast for clearer deep-sky observation and imaging.\u003c\/p\u003e","products":[{"product_id":"astronomik-cls-filters-available-in-a-variety-of-sizes","title":"Astronomik CLS Filters available in a variety of sizes.","description":"\u003ch1\u003e\u003cstrong\u003eThe Astronomik CLS is a budget filter for visual observation, Black \u0026amp; White photography and CCD photographs of nebulae, galaxies and star clusters with astronomical instruments of any size.\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003eThe Astronomik CLS blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass. All the important emission lines, as well as the spectral region that the very well dark adapted eye can see, can pass through the filter.\u003c\/div\u003e\n\u003cdiv\u003eMain use\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eHow to read the chart\u003c\/div\u003e\n\u003cdiv\u003eSuitability\u003c\/div\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): Good, 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: Good, when used with an additional IR-block-filter\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): Good, when used with an additional IR-block-filter\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\u003cdiv\u003eTechnical Data\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e92% transmission at 486nm (H-beta)\u003c\/li\u003e\n\u003cli\u003e92% transmission at 496nm (OIII)\u003c\/li\u003e\n\u003cli\u003e92% transmission at 501nm (OIII)\u003c\/li\u003e\n\u003cli\u003e97% transmission at 656nm (H alpha)\u003c\/li\u003e\n\u003cli\u003ePass from 450 to 540nm and beyond 650nm\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 ship filters with a completely new design. Any kind of halo or strange reflection is a matter of the past\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Dark Clear Skies for all your needs","offers":[{"title":"Astronomik CLS 1.25\" (M28.5)","offer_id":42055649624241,"sku":"","price":71.0,"currency_code":"GBP","in_stock":true},{"title":"Astronomik CLS 2\" (M48)","offer_id":42055649657009,"sku":"","price":152.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-cls-filters-available-in-a-variety-of-sizes-398730.jpg?v=1718364460"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/collections\/astronomik-cls-filters-for-clear-sky-observations-859554_64325d1c-f8e6-44ca-a492-23fba65edd5b.jpg?v=1730873210","url":"https:\/\/www.darkclearskies.co.uk\/collections\/astronomik-cls-filters-for-clear-sky-observations.oembed","provider":"Dark Clear Skies ","version":"1.0","type":"link"}