Astronomik CLS Light Pollution Filter - Canon EOS APS Clip

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  • Regular price $129.95
  • Astronomik CLS Light Pollution Filter - Canon EOS APS Clip

    • Sale
    • Regular price $129.95
    • ITEM #



    Astronomik CLS Light Pollution Filter - Canon EOS APS Clip

    Astronomik CLS Light Pollution Filter - Canon EOS APS Clip

    The Astronomik CLS is a budget filter for visual observation, Black & White photography and CCD photographs of nebulae, galaxies and star clusters with astronomical instruments of any size.

    The Astronomik CLS blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass. All the important emission lines, as well as the spectral region that the very well dark adapted eye can see, can pass through the filter.

    The filters are optimized for use with aperture ratios from 1:3 to 1:15. Transmission losses and chromatic distortions, which are problems with other filters, only appear with Astronomik filters when extremely bright aperture ratios of 1:2 and more are used. The CLS filter is suitable for use with telescopes of all aperture sizes and even works well with binoculars.

    The Astronomik CLS Light Pollution Filter is good for use under both dark and urban skies for reducing light pollution made by mercury-vapor lamps. For film photography and modified DLSR use, the CLS filter gives good performance and near perfect color balance. While this filter does perform well with webcam and video equipment under light polluted skies, it is not suitable for planetary use.


    • Visual observation (dark skies): Good, to reduce light pollution by mercury-vapour lamps (streetlight)
    • Visual observation (urban skies): Good, an UHC-E or UHC filter is more suitable
    • Film photography: Very good, colour 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, colour 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

    About the Astronomik Clip-Filter System....

    The patented Astronomik Clip-Filter System is black anodized aluminum and laser-cut on state-of-the-art modern machines. It can be inserted within seconds directly into the EOS camera body. There are no changes necessary and all lens functions (focus, screen, image stabilization) remain functional!

    Almost all Canon system lenses (with the exception of the EF-S series) and all M42 and T2 lens adapters, can be used with the Astronomik Clip-Filter System. The Clip-Filter System also acts as an outstanding dust shield, which prevents the possibility of dust settling on the sensor during long time exposure (The MC-Clear filter does not have a filter effect and only acts as a dust shield.)

    Note: For Photographers interested in daylight IR-Photography a "MC-modification" is possible for some cameras. If you are interested in this, please send us a short mail. We will give you more details. The "MC-modification" gives you no advantage for normal astrophotography! If you have a full-frame EOS camera, like the 5D or 6D, you should buy the Astronomik CLS XL EOS Clip Filter instead.

    Astronomik Visual CLS Light Pollution Filter - Canon EOS Clip Features.

    • 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 beyond 650nm
    • 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

    Astronomik Product Number: CLS-EOS

    Additional Information

    Filter TypeCLS
    Free ShippingYes
    Warranty10 Year Warranty

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    Questions & Answers

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    • is this the filter you where showing at the ny show and can I put it in my 60d

      Yes, Gerd from Astronomik Filters was at NEAF with OPT and was showing this filter. This clip filter is for the APS-C format Canon cameras, so it will work with the 60D when it is connected to telescopes and EF (but not EF-S) Canon lenses.

    • Will this filter fit the canon t5i?

      Yes, this filter will fit all of the newer Canon Digital Rebel cameras as well as the later XXD crop bodies. The T5i will work fine, though if you plan on shooting through camera lenses with this installed you must use EF lenses for full frame, not EF-S c

    • Will it fit/work with Canon EOS 7d?

      This is indeed the filter that you need for the Canon 7d. The Canon 7d is an APS-C format camera and this filter is made for APS-C format.

    • Say you do have two scopes mounted on this mount; can each be moved via hand controls? Also, can motorized controllers be fitted on this mount?

      The Twilight II is a fully manual mount and cannot be motorized. The two saddles do not move independently - they both point the same direction.

    • will this filter fit the t31?

      If you mean the Canon Rebel T3i, then yes this filter will fit.

    • Will it fit/work with Canon EOS REBEL T3?

      Yes, the Astronomik EOS clip filters will wok with the Canon EOS Rebel T3.

    • The filter Astronomik CLS Clip Filter for Canon EOS cams produce goods results with Canon EOS 60D and the TPO RC6?

      This filter will be a good match for a Canon 60D. It will cut out yellow/orange Mercury and Sodium emission lines from artificial lights and will trim some of the Oxygen Skyglow towards the blue end of the spectrum. In general, background light pollution

    • Does this have GO To ability? My OTA weights 11 lbs, will this handle it?

      The Vixen GP2 is non-motorized and the motors can be purchased separately. At this time there is no way to add Go To with this mount. This mount will carry an 11 lb OTA without an issue as long as you have enough counterweights to balance.

    • I see lots of words about this filter, but where are the charts showing cutoff frequencies, transmission, etc?

      The transmission graph is listed on the manufacturer's website here:

    • Does it fit the Canon 50D?

      Yes, the EOS Clip filters will fit a 50D. You will be able to hook it to a telescope with a T ring or use full-frame EF lenses, but the crop frame EF-S lenses will not attach with the filter in place (the back of the lens will hit the glass).

    • Will this filter fit the Canon Sxi (450D)?

      yes, it will work with the Canon XSi

    • Does the CLS LP filter work on a Canon 60D attached with a T ring to Celestron EDGE SCT?

      Yes, this will work without any issues.

    • How easily will this install in my Canon 300D? Are there any modifications to the camera necessary to use this product?

      It is very easy to install one of these filters into Canon EOS camera with an APS-C Chip. you just simply press the filter into the inner rim inside the camera body and the filter housing will press in the inside of the rim. You can install one of these f

    • Does it fit in the Rebel SL1?

      Yes, This filter will fit any Canon camera with an APS-C sensor, like the SL-1.

    • Does it fit in Canon EOS 700D ? and 70D

      Yes, the APS-C version of the EOS Clip filter will fit both the Canon EOS 700D and 70D camera bodies.

    • Will this filter work on the 5D MKII ?

      This specific filter is only designed for APS-C sensors. If you are looking for one that will fit your full frame camera, I would recommend the AK-CLS-EOSXL. herre is a link to the product page

    • If I use this with a "DSLR (original)" for nightscapes will the color of the land be shifted any? And if so will the shift be correctable?

      Yes, the color will be shifted quite a bit toward cyan as the red, orange, and yellow parts of the light pollution are cut out of the spectrum. This is mostly correctable by setting the black points of your R, G, and B channels separately and then doing

    • Will the use of an Astronomik CLS Canon clip filter in an unmodified stock T5i really result in greater red response as some seem to say? If so that doesn't seem reasonable if the stock IR filter is still present. Please explain. Thank you.

      The filter does not lead to greater absolute red response, but it certainly leads to greater relative red response by suppressing other wavelengths of light that contribute to light pollution. You will need to take longer exposures when using this filter

    • Will this fit a canon sl1

      Yes, this clip-in filter will fit the SL1 and most other Canon APS-C DSLRs.

    • Will this filter work in a rebel t6i?

      Thank you for your question. This filter will indeed work with your Canon Rebel T6i.

    • Will the filter fit in the canon t6i

      This filter will fit a Canon T6i.

    • Can I use the filter with my Canon 60Da and my Tokina 11-16mm crop lens?

      Probably, as the Tokina lens is not the same as a Canon EF-S lens (the rear glass does not project as far back), but we cannot say for 100% sure.

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