Quote:
Originally Posted by neurosis3000
Thanks, Marc! Yes I’ll try to pay more attention to focusing next clear night. I noticed that earlier subs were more in focus but later ones seemed not. I’ll have to figure out why. Maybe temperature? Ambient was about 12C at the start but dropped to around 8C by the end here.
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That's correct. Temperature can play a big role depending on the type of telescope. A rag to cover it will help with temperature shifts. You can also refocus manually every 30min or so at the beginning of the night.