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Model: 8h00lcBrand: Astronomik
Generally In Stock, Please Confirm Before Ordering
The Astronomik CLS is a budget filter for visual observation, Black & White photography and CCD photographs of nebulae, galaxies and star clusters with astronomical instruments of any size.
The 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.
Main useThe filters are optimized for use with aperture ratios from 1:3 to 1:15. Transmission losses and chromatic distortions, which are problems with other filters, only appear with Astronomik filters when extremely bright aperture ratios of 1:2 and more are used. The CLS filter is suitable for use with telescopes of all aperture sizes.
SuitabilityVisual observation (dark skies): Good, to reduce light pollution by mercury-vapour lamps (streetlight)Visual observation (urban skies): Good, an UHC-E or UHC filter is more suitableFilm photography: Very good, colour balance is near perfectCCD photography: Good, when used with an additional IR-block-filterDSLR photography (original): Good, colour balance shifted but contrast enhancedDSLR photography (astro modified): Very good, colour balance is near perfectDSLR photography (MC modified): Good, when used with an additional IR-block-filterWebcam / Video (Planets): UnsuitableWebcam / Video (Deep Sky): Very good, if light pollution is a big problem
Technical Data92% transmission at 486nm (H-beta)92% transmission at 496nm (OIII)92% transmission at 501nm (OIII)97% transmission at 656nm (H alpha)pass from 450 to 540nm and beyond 650nmParfocal with other Astronomik filtersGlass thickness: 1mmCompletely resistant against high humidity, scratches and aging effectsDiffraction limited, the filter will not reduce the optical performance of your telescope!Astronomik filters are delivered in a high-quality, long lasting, filter boxSince 2008 we do ship filters with a completely new design. Any kind of halo or strange reflection is a matter of past
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