Quote:
Originally Posted by Craig_
I don’t think it’s movement when slewing around. In that example I gave, critical focus with HFD was made, then I skewed to Rigil Kent, saw the mask focus was way off, went back to my target and focus was unchanged. So between slewing to, and back from, Rigil Kent, the telescope remained in focus although the check of the mask while on Rigil suggested that (if the mask was to be trusted) it was out of focus, FWHM after returning to my target was excellent.
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Yes, I would expect the scope to be in focus for the orientation where focus was achieved even if you moved away temporarily from that position. The question is whether the scope was still focused in the other orientation where the Bahtinov indicated that it was not.