Astronomik CLS CCD Deep Sky & Light Pollution Filter 2-Inch
The 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 beeing passed. The supplementary IR-blocking layer allows the use for DSLR- and Webcams without an integrated IR-block filter.
- Easier resolution of Double Stars.
- With the EOS-Clip model, photography with DSLR cameras is feasible even unter extreme light-polluting conditions without shifting the white balance.
- The 1,25" and 2" socket models can be used for observations from light-polluted areas.
- If you plan to create color images from emission line data, our CLS-CCD filter is a great choice for the Luminance channel
CLS: For cameras with an integrated IR-filter or for visual observation.
- Visual observation (dark skies): Good, to reduce light pollution by mercury-vapour lamps (streetlight)
- Visual observation (urban skies): Reasonable, an UHC-E or UHC filter is more suitable
- Film photography: Very good, colour balance is near perfect
- CCD photography: Very good, optimized rejection of light pollution
- DSLR photography (astro modified): Very good, colour balance is near perfect
- DSLR photography (MC modified): Very good, colour balance is near perfect
- DSLR photography (original): Very good, colour balance shifted but contrast enhanced
- Webcam / Video (Planets): Unsuitable
- Webcam / Video (Deep Sky): Very good, if light pollution is a big problem
- 97% transmission at 656nm (H-alpha)
- 95% transmission at 486nm (H-beta)
- 95% transmission at 496nm (OIII)
- 95% transmission at 501nm (OIII)
- pass from 450 to 520nm and from 640 to 690nm
- Parfocal with other Astronomik filters
- Glass thickness: 1mm
- Diffraction limited, the filter will not reduce the optical performance of your telescope!
- Completely resistant against high humidity, scratches and aging effects
- Astronomik filters are delivered in a high-quality, long lasting, filter box