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A Cold Mirror
We have all seen/know the problems with a mirror that is significantly warmer than ambient air, but in the summer I have the opposite extreme. The house (and presumably mirror!) is usually kept under 25C, but it can be well over 30 when I'm out observing at night (35C right now at 10 PM).
What effect will this have on my observing? I always put the scope out early with the fans on to warm the mirror up, but was wondering if I should leave it cold, would that create still air in the tube?
Any opinions?
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