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Thanks for your help Fred.
What do you mean by "square to the tube"?
If dew can cause it that it's probably why it happens. I have a lot of problems with it and dew is forming on my both scopes. But if it's because of dew then why only the left bottom corner is affected? Also I'm usually getting bad stars at this corner at the beggining when there is no dew on my imaging scope.
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