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What sort of scope are we talking about BTW?
As a rule I always check collimation before any session and quite often during sessions. My scope hold collimation pretty well but as temp changes and it is being moved around the sky it will sometimes need a tweak.
Smaller scopes, eg an 8" dob, probably don't need as much checking, but it is still a good habit to get into and the more you do it the quicker it becomes.
Malcolm
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