Vallis Alpes - 20220111 - Celestron C6 at 2700 mm (altazastro)

Contains: Solar system body or event

Vallis Alpes - 20220111 - Celestron C6 at 2700 mm

Acquisition type: Lucky imaging

The imaging of this subject on the same night turned out better with an IR CUT rather than with an IR PASS filter, even in quite bad (4) seeing.
During this session I have realized that, at least with the 150 mm aperture of the C6, IR filtering is not really convenient, at least with the Moon and at least when it is high enough over the horizon as not to suffer too much of atmospheric dispersion.
Indeed what I experienced is that, even with bad seeing, if one takes a long enough video (which may mean tens of GB) and then selects just the 5-10% best frames, one can obtain better images using the monochrome camera "full spectrum" (with just an IR-CUT filter at 750 nm in my case) rather than the IR PASS.
Of course lower wavelengths provide more resolution, but also, due to camera sensitivity peaking in the green region, they allow for shorter exposure times, which in turn can help work around atmospheric turbulence, at least partially.
So if one takes enough frames (say 30000) and then stacks only the best 1500-3000 of them, the result, at least in my particular situation (telescope and camera) is preferable to that obtained by using the same setup but with an IR Pass filter.
It is true that I use an Astronomik IR642, which has a limited bandpass of 642-842 nm, but again, given the limited scope aperture and the camera sensitivity, using a "true" IR PASS filter (say the IR 685 one) would not change much in term of luminosity, while possibly worsening resolution a bit.

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Vallis Alpes - 20220111 - Celestron C6 at 2700 mm

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