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What is the use of the fan on the bottom of my dob?
Hi there, Sorry if this seems like a daft question.
I have just bought myself a 12" Dobsonian and I've noticed on the forums
that everyone keeps mentioning that they need to cool their dobs down
before they use them but I take mine outside, put the eye pieces in and
start looking and I can't see any difference between the beginning of the
night and the end. Is there something I'm missing?
Regards.
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