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When I first looked through my new scope, I couldn't get it focused and thought it was a collimation problem. But after leaving the scope to cool for 1/2 hour, things cleared up heaps. Personally, I wouldn't dive in and twist those knobs too soon.
Same with the dusty mirror, I think that most people would agree that a lightish coating of dust on the mirror won't affect what you see through the EP too much. Whereas an accidental scratch from cleaning will effect it for ever.
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