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Well on a clear night the air temp is always above the dew point and by blowing that air over the mirror it will be close to equalization with this temp. If this was below dew point a mist or fog would make you pack up anyway. Different story if we are talking about a corrector plate that will loose heat directly into space than in a closed tube Newt.
I have had the newt from sunset to sunrise in high humidity with no dew on the mirrors, mind you the tube was dripping everywhere!
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