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Astronomik CLS Light Pollution Filter - CCD 2" Mounted


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Product Details

  • A CLS CCD Light Pollution Filter - 2-inch Mounted by Astronomik:

    The Astronomik CLS CCD is suitable under light-polluted skies for DSLR Cameras, which have been remodeled 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 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 being passed. The supplementary IR-blocking layer allows the use for DSLR- and Webcams without an integrated IR-block filter.

    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-inch and 2-inch 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.

    Astronomik CLS CCD Light Pollution Filter - 2-inch Mounted Features:

    • 92-percent transmission at 486nm (H-beta)
    • 92-percent transmission at 496nm (OIII)
    • 92-percent transmission at 501nm (OIII)
    • 97-percent 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
    • Connection is 2-Inch socket with M48 x 0.75 connection thread. 


    OPT Product Number: AK-CLSCCD-2


  • specifications

    Filter TypeLight Pollution/City Light Suppression
    Free ShippingYes
    Warranty10 Year Warranty

Product Reviews

Customer Reviews
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Filter Reviews:
    A OPT Telescopes Customer
    BRYAN G.
    United States United States

    Great Light Pollution Filter

    This is one of the best filters I have ever owned. I bought this filter after to compliment my Celestron RASA 8", which I also bought from OPT. It does an amazing job cutting down the star bloat from the fast optics on the RASA. It also has improved my lunar photography due to there being an IR cut filler built in. To see my photos check out my IG @bryangoffphoto

    Robert S.
    United States

    Good product delivered in a

    Good product delivered in a timely manner. Who could ask for anything more?

    Brian S.
    United States

    Astronomik Light Pollution Filter - CCD 2”

    Arrived quickly from OPT. Very good filter. Dramatically improves contrast and clarity in the Orion Nebula with visual observing under lightly/moderately light-polluted skies. The CCD version gives a bluish hue as expected. I don’t have experience with other light pollution filters so can’t compare. I can’t wait to see the results with imaging, which was my primary reason for purchasing.


    Customer review

    I've tried many different LP filters and this one is hands down the best filter to date. I can't say enough good things about this filter in a short review so bottom line.....The best out there. I use the 60da and wasn't sure it would work to well not really knowing the specs on the factory mod but to my surprise it pulled in the photons and didnt clip the valuable data. you would never know that the subs came from an area so polluted with light that you could almost read a newspaper in the dead of night from the skyglow and niegbors security lights. don't waste your money on an economy filter.


    Customer review

    The best Light Pollution filter Ive ever used. Great contrast on galaxies from my backyard in the city.