Astronomik L-2 UV-IR Block Clip-Filter EOS M APS-C

  • $99.95
    Unit price per 

Clip-Filter system for Canon EOS M APS-C Mirrorless cameras

Do you own a Canon EOS digital camera for astro-imaging? Then you have surely encountered the following problems:

  • Large filters for large camera lens objectives are very expensive
  • If you are using an Off-Axis Guider stars will be dimmed on your autoguiding camera when a 2" round mounted filter is threaded to a corrector being ahead of the reflecting prism from the light path. 
  • With long exposure times your camera’s sensor chip is exposed to more dust


With the Astronomik Clip-Filter System you can take care of all of these problems at once!

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 M camera body. There are no changes necessary and all lens functions (focus, screen, image stabilization) remain functional!

The clip filters for Canon EOS M Mirrorless cameras can be used with all lenses known till today with the EF-M Bayonet. With the adapter EF-M to EF/EF-S all Canon lenses and all lenses from other manufacturers with Canon Bayonet can be used. Of course, you may use the filters when the camera is attached to your scope too.

The filters are optimized to be used with normal lenses and with a telescope.


Use Astronomik filters for your EOS M and enjoy marvelous images with an ultra light equipment!


Astronomik L-2 UV/IR Block Clip-Filter EOS M APS-C

The Luminance channel is probably the most important for a great final image! You want as much signal as possible so the filter should have the highest transmission possible with a wide spectral bandpass. This combination provides the greatest sensitivity and gives you the highest photon counts on your pixels. While the high transmission level is a great aspect of the new Astronomik Luminance filters, not all optical instruments or additional optical elements like correctors, field-flatteners or reducers, have perfect colour correction so it can be the width of the spectral band pass of  the Luminance filter that can cause problems. A band pass that is too wide will allow the transmission of incompletely focused light (Chromatic aberration), making stars appear soft or bloated. In such cases image processing can become difficult, so having a slightly narrowed spectral window in your Luminance filter can reduce or eliminate this damaging effect.

To give you all the tools to gather the best data possible we have expanded our line of Luminance filters: Now you can select a Luminance filter perfectly matched to the kind of telescope you use, to get the highest signal and sharpest image for the Luminance channel!
Depending on the color correction of your scope you may use a wider spectral window for the Luminance data. The L1 filter has the widest spectral window, the L2 is about the same as our current L-Filter and the L3 is much narrower.
If you use an optical system that is completely free of any chromatic aberration you should get an L1 filter for your setup. For general use the L2 filter is well suited to most optical systems with a corrector, flattener or reducer in the optical train while the L3 filter is designed for users of refractors with a less-than-perfect color correction and in combination with the new Deep-Sky RGB filters, the L3 filter will minimise the problem of bluish halos around stars.

The transmission curve characteristics and coatings on the new Luminance filters have been designed and engineered in such a way that no halos or reflections will be visible. Even with bright stars in the field of view you will be able to reveal the faintest structures in nebulas or galaxies.

Like all Astronomik Filters, the new Luminance filters are made using an extremely durable and scratch resistant coating, deposited on the finest polished optical substrate, which is free of any striae or internal strains. All substrates are made to exactly the same thickness, so all of our filters are parfocal.


    Hint for a very usefull accessory:

    The EOS M, M10 and M3 are a little bit difficult to use for deep Astrophotography because any exposure time longer than 30sec can be done via pressing the exposure-button only, or via Infrared. (Up to 30sec can be set in the camera, but USB control for longer times does NOT work.) However all IR-Intervalometers we tried, do not work properly: When set to Bulb-Mode there are two IR-commands required, the first to open the shutter, the second one for closing it at the end of the exposure. All normal IR-Intervalometers do not handle that correct and a break of the length of the exposure time is the result. Good news: There is a device that handles it correct, the "SteveMRI MultiCam LEI Intervalometer" ( changes the signal from a normal programmable intervallometer to proper IR-commands! At the beginning of the exposure a signal is sent to the camera, a second one when the exposure time has ended. With this device all features of a normal programmable timer (Time-to-start, length of exposure, break between exposures, number of exposures) can be fully used. If you have a advenced device for exposure-ramping even this will work: Simply plug the cable into the LEI Intervalometer and it will convert all signal to proper IR-Commands. (Direct Link to the MultiCam LEI Intervalometer)


    Watch the following video to see how easy the clip filters can be used: 


    Technical Data

      • Filter Type: UV/IR/Luminance
      • Transmission Wavelength: 385 nm - 695 nm
      • Bandwidth/Bandpass: 310 nm
      • Filter Optical Thickness: 1 mm


      • The filters can be used with Canon EOS M1, M10, M3, M5, M6, M6 MkII, M50, M50 MkII, M100 and M200 bodies. (We never got a M2 in Europe.)
      • The filters can be used with all EF-M lenses
      • The Clip filter may be used with all other Canon lenses. (Using the Canon adapter from EF-M to EF)
      • The Clip filter for Canon APS-C fit into the Original Canon Adapter from EF to EF-M bayonet

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