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Mainly because the mirror has to be close to the air temp. outside where your using it.
If you store the scope indoors, its gonna be warmer in there than outside. After u set the scope up, the mirror is gonna take a certain amount of time to reach the ambient air temp. For my 12.5" mirror it takes 3 hours. ummm, no....a scope doesn't generate heat while your using it.
Asimov
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