Astronomik - CLS CCD Light Pollution Filter - 36mm Round Unmounted

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The Astronomik CLS CCD is suitable under light-polluted skies for DSLR Cameras, which have been remodeled for astronomical use.

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Product Description

Astronomik CLS CCD Light Pollution Filter 36mm Round Un-Mounted

The Astronomik 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.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 and therefore  is suitable under light-polluted skies for DSLR Cameras which have  had the IR Filter removed. For astronomical use. the filter enhances the contrast between all deep-sky objects and the background. . 

Other uses for the Astronomik CLS CCD Light Pollution Filter include easier resolution of Double Stars and with the EOS-Clip model, photography with DSLR cameras is feasible even under extreme light-polluting conditions without shifting the white balance. The 1.25" and 2" models can be used for visual 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.

Astronomik CCD Filter Quality Characteristics:

Superior Substrate: Astronomik filters consist of a precision polished substrate on which the actual filter, in the form of very thin dichroic layers, is applied. These high quality measures will in no way reduce the performance of your optical train. Contrary to common experience with other manufacturers’ filters, with Astronomik filters stars remain fine needle points of light!

Coating: Astronomik filters consist of up to 130 layers deposited on top of the completely transparent carrier glass. These layers comprise both the actual filter and an antireflective coating.

Parfocal Filters: All Astronomik CCD Filters are parfocal. When changing filters, the focal point will not change; you will not have to refocus your camera. This is due to the high tolerance and very low thickness of the substrate and coating.

Durability: Astronomik filters are completely scratch resistant, and not sensitive to moisture, dew, or high humidity (touching a dewed-up filter will, of course, not destroy it...if it is made by Astronomik!). With others´ filters, after a few years, you quickly notice their filters degrade and are not at their full, new capability. Not so with Astronomik filters which maintain their "brand new" transmission specifications. And, because of Astronomik´s extraordinarily resistant coating technology, Astronomik filters come with a 10 year warranty.

Astronomik CLS CCD Light Pollution Filter Performance:

  • 92% 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 from 640 to 690nm
  • Parfocal with other Astronomik filters
  • Glass thickness: 1mm
  • Completely resistant against high humidity, scratches and aging 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


Name Astronomik - CLS CCD Light Pollution Filter - 36mm Round Unmounted
Manufacturer Astronomik


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