Astronomik CLS CCD Deep Sky & Light Pollution Filter 1.25-in

Product code: 8h00dp
£89.00
An excellent general purpose light pollution filter - perfect for astrophotography and visual use.
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Astronomik CLS CCD Deep Sky & Light Pollution Filter 1.25-in
The Astronomik CLS CCD is suitable under light-polluted skies for DSLR Cameras, which have been modded for astronomical use. The filter enhances the contrast between all deep-sky objects and the background.
The 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 optimised 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.

FEATURES
95% transmission at 486nm (H-beta)
95% transmission at 496nm (OIII)
95% transmission at 501nm (OIII)
97% transmission at 656nm (H-alpha)
Pass from 450 to 520nm and from 640 to 690nm
Not sensitive to high humidity or ageing effects
Scratch-resistance!
Excellent quality substrate, diffraction limited - the optical performance of your telescope will not be reduced
Parfocal with other Astronomik filters
1mm Glass Thickness
Supplied in a high-quality, long lasting, filter box
Main use
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 passed.

The supplementary IR-blocking layer allows the use for DSLR- and Webcams without an integrated IR-block filter.

Other uses
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 colour images from emission line data, our CLS-CCD filter is a great choice for the Luminance channel

Suitability
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, optimised rejection of light pollution
DSLR photography (original): Good, colour balance shifted but contrast enhanced
DSLR photography (astro modified): Very good, colour balance is near perfect
DSLR photography (MC modified): Very good, colour balance is near perfect
Webcam / Video (Planets): Unsuitable
Webcam / Video (Deep Sky): Very good, if light pollution is a big problem
Technical Data
95% transmission at 486nm (H-beta)
95% transmission at 496nm (OIII)
95% transmission at 501nm (OIII)
97% transmission at 656nm (H-alpha)
Pass from 450 to 520nm and from 640 to 690nm
Scratch-resistant!
Excellent carrier material. The optical performance of your telescope is not reduced by the filter in any way.
Parfocal with other Astronomik filters
Glass thickness: 1mm
Completely resistant against high humidity, scratches and ageing effects
Diffraction limited, the filter will not reduce the optical performance of your telescope!
Astronomik filters are delivered in a high-quality, long lasting, filter box
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Brand Astronomik
Condition New
Product Code 8h00dp