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Model: ak_mc_clear_125Part Number: 8H0023
This filter should be used if the focal plane of your imaging system should stay in the same place as with other Astronomik filters in place. The multicoating prevents you from unwanted reflections. It blocks neither IR nor UV.The second main application is dust protection of your system (telescope or camera). As the filter doesn’t modify the spectral transmittance of your system it doesn’t alter the colours. It’s great for keeping all dust away from your optics or sensor.
The Astronomik MC Clear is made by the same high-end process as all other Astronomik filters. The coating has the same scratch resistance and the substrate has the same high quality. Because of this it is parfocal with all other Astronomik filters and can be used in any optical system for dust protection without modifying the spectral characteristics and without destroying the optical performance of your system.
You should think about using the IR-blocker or even the UV-IR blocker if you have a system with any refracting elements.
The major emission lines of artificial 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
I have the EOS-M clip-in version of this filter. Optically, it is very good, and protects the camera sensor well when no lens is fitted. But there is no explicit mechanism for holding the disc of the filter in place (unlike larger sizes, which have plastic springs). Although it hasn't fallen out yet, Sod's Law dictates that it will, sometime in the dead of night, just when you are trying to catch some transient phenomena. Could have been better engineered.
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