Astronomik CLS Light Pollution Filter - Canon EOS APS Clip

  • Eliminates the problem of city light pollution
  • Well-suited for most visual astronomy and astrophotography applications
  • Exceptional quality and easy to install
  • Impressive transmission rates without hindering optical performance
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  • Regular price $129.95

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Astronomik CLS Light Pollution Filter - Canon EOS APS Clip

The Astronomik CLS (City Light Suppression) Filter is a perfect solution for dealing with light pollution when imaging or observing the night sky. This light pollution filter blocks the light coming from mercury and sodium-vapor lamps that are extremely common in modern society. While these wavelengths are blocked, the light coming from nebulae, stars, and galaxies is preserved for our viewing pleasure. These Astronomik Clip Filters are also extremely convenient because the entire installation process is simply clipping the filter onto the camera. No matter if you’re at a dark site or in the city, having a light pollution filter will improve your experience.

Well-suited for most applications

Grabbing a light pollution filter is guaranteed to improve your imaging and/or viewing capabilities in almost every situation. Whether you decide to do some photography or record video, this filter can be used. For the various conditions this could be used in, refer to the list below for ideal performance:

  • Visual observation (dark skies): Good, to reduce light pollution by mercury-vapor lamps (streetlight)
  • Visual observation (urban skies): Good, a UHC-E or UHC filter is more suitable
  • Film photography: Very good, color balance is near perfect CCD photography: Good, when used with an additional IR-block-filter
  • DSLR photography (original): Good, colour balance shifted but contrast enhanced
  • DSLR photography (astro-modified): Very good, color balance is near perfect
  • DSLR photography (MC modified): Good, when used with an additional IR-block-filter
  • Webcam / Video (Planets): Unsuitable
  • Webcam / Video (Deep Sky): Very good, if light pollution is a big problem

Exceptional Filter Design

The Astronomik Clip-Filter design is comprised of black anodized aluminum and is laser-cut for extreme precision. These filters were created with the intent of being a catch-all for each respective camera manufacturer, with one size per brand fitting most cameras in their line. Once you get your hands on one of these, you’ll be excited to see how easy it is to install. Just clip it in as the name states, and you’re good to go!

Astronomik CLS Light Pollution Filter Main Features

  • 92-percent transmission at 486 nm (H-beta)
  • 92-percent transmission at 496 nm (OIII)
  • 92-percent transmission at 501 nm (OIII)
  • 97-percent transmission at 656 nm (H-alpha)
  • Pass from 450 to 540 nm and beyond 650 nm
  • Parfocal with other Astronomik filters
  • Glass thickness: 1 mm
  • Completely resistant against high humidity, scratches and aging effects
  • Diffraction limited, the filter will not reduce the optical performance of your telescope!


    OPT Product Number: AK-CLS-EOS



    Filter TypeCLS
    Free ShippingYes
    ShapeCanon APS/ C
    Warranty10 Year Warranty

    Customer Reviews

    4.5 Based on 11 Reviews
    5 ★
    4 ★
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    Brad G.
    United States United States

    Big Improvement

    Using this filter with my Astro Modded Cannon T6 and it does and excellent job of blocking unwanted light pollution from a Bortle 5 skies. Makes the Milky Way Photos POP

    United States

    First time using a clip in LPS filter.

    The filter came well packaged, no surprises and was exactly what I expected. Seemed a little too easy to use so I watched a couple of YouTube videos to make sure I was installing it correctly. Sure enough just clip the filter in and your ready to go...just had to wait for a clear night to test it. I live in a little pocket of dark sky within a big city and I was totally amazed at how clear and crisp my images were once the night sky was clear. I used a Canon t7i with a full frame 50mm and large 400mm prime and was able to capture clear images of Pléiades from my backyard. My camera is unmodifided but once I do have the Astro-modification done I will update my filter to the CLS-CCD version for use with eather my lenses or telescope depending on how much time and clear sky’s I have for the night.

    James H.
    United States

    great results and great fit

    Title is completely accurate, huge improvement vs no filter, mechanically perfect mount, easy install and removal... but 4 stars not 5 because the resulting bluish tint will indeed require post-processing on any images you intend to really use and enjoy, share w/ others.

    Floyd W.
    United States

    Light pollution filter

    It’s the only LP that that I have tried that actually does improve images in a helpful way under heavy light pollution conditions

    Jon G.
    United States

    Definitely improved astrophotography from my city dwelling.

    I live in San Diego, just a quarter mile from the ocean, and my skies are heavily light polluted. Most nights I’m lucky to make out a dozen stars. My very first night with the Astronomik CLS filter in my Canon Eos T6i (unmodified) resulted in a beautiful image of the globular cluster M4, on a night when I could barely see the adjacent star Antares. I was blown away. I’ve used it several nights since with equally good results. Definitely recommend for light polluted skies. On the other hand, don’t forget to take it out when you’re in a nice dark sky setting.

    Terry P.
    United States

    LP camera filter

    The filter inserts easily into the Canon camera. I image from a very light polluted area in Florida, and it’s amazing the amount of light the filter blocks. I use a CMOS camera on my main scope with other astronomic filters, but I also like to capture constellations and large open star clusters with a camera and lens setup. Before I bought the filter I could not use the camera as a standalone imaging unit without traveling many miles to a dark site. Now using the filter I can set up at home and capture excellent images through the camera. These filters are not cheap but they are worth every penny if you want to block light pollution.