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Hi Dennis
Thanks for the comment, yes it was a bit more difficult, I have marked on the focuser of the Tak my start positions for PF, Focal Reducer and Focal Extender. I normally go straight to that point and start final focus from there, for some reason putting the O111 filter in changed that completely, was lucky that there are a few bright stars in and around M17 to focus on.
Been wanting to do this shot for awhile.
Cheers
JohnG
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