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Use a Hartman screen, then look at a bright star and focus..
When all 3 stars line up to a single star, your in focus.
Thats how i do it.
But for really good shots, take an image and magnify it a few times. If you only see 1 star then your in very good focus. If you can just see 3 stars, then keep tweaking the focus a little and taking shots to double check. Exposure whould only be about 1 sec or less for a bright star.
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