Astronomik CLS Deep Sky & Light Pollution Clip Filter for Visual Observations B&W and CCD Photography
Mounted filter in EOS-M Clip Cell
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.
We are proud to unveil the new Clip-Filter for the compact Canon EOS M series!
The filters can be used with the standard EF-M 18-55mm IS lens. With the adapter EF-M to EF from Canon all Canon lenses and all lenses from other manufacturers 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.
Compatibility:
Use Astronomik filters for your EOS M and enjoy marvelous images with an ultra light equipment!
Watch the following video to see how easy the new filters can be used:
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.
How to read the above chart?
* The horizontal axis is the Wavelength in Nanometers (nm). 400nm is deep blue, at 520nm the human eye senses green and at 600nm red. At 656nm is the famous "H-Alpha" emission line of hydrogen.
* The transmission in % is plotted on the vertical axis.
* The red line shows the transmission of the filter.
* Visual filters: The grey line filled with grey in the background shows the relative sensitivity of the human eye at night. The maximum is at ~510nm and drops to longer and shorter wavelengths. You can easily see, that you can´t see anything of the H-alpha line at night (even if you can during daylight!) The sensitivity of the eye at 656nm is 0% at night!
* Photographic filters: The grey line in the background shows the sensitivity of a typical CCD sensor.
* The most important emission lines from nebulas are shown in green. The most important lines are from ionized Hydrogen (H-alpha and H-beta) and double ionized oyxgen (OIII) .
* The most important artifical emission lines are shown in orange. The artifical light pollution is dominated by mercury (Hg) and sodium (Na), which are used in nearly all streetlights.
The major emission lines of artifical light pollution:| Hg 435,8nm | Hg 546,1nm | Hg 577,0nm |
Hg 578,1nm | | Na 589,0nm | Na 589,6nm |
Na 615,4nm | Na 616,1nm |The major emission lines of nebulas: H-β 486,1nm | OIII 495,9nm | OIII 500,7nm |
H-α 656,3nm
Please note, image is for demonstration purposes only. Shows the CLS version of the same EOS Clip-type of filters. Digital camera is not included.
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