Years ago when I to to play with a SBIG for the night on my system we found the best way is to make a Hartman Mask (disc with 2 holes in it on front of scope) put SBIG in focus mode choose a medium star. From what i can remember focus mode updates very fast, almost like Live View, the Mask makes stars appear double if not focused. Adjust focus till double star comes together. It took us moments to do and gave near perfect focus each time.
Scott
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