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Thanks for all the replies so far. I didn't realise what a complicated topic this is! The manufacturer of my scope installed fans that suck (down the tube, not rubbish fans!), and with posts I'd seen about fans blowing air onto the rear of mirror I wondered if this was correct.
One other thing, in daylight when you look down the tube it looks quite dark, but when you switch the fans on you can see a fair amount of light leakage onto the lower inner surface of the tube at the edge of the mirror. Need a baffle or filter to stop the light leakage?
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