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Old 07-07-2012, 04:35 PM
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gregbradley is offline
Join Date: Feb 2006
Location: Sydney
Posts: 15,515
Originally Posted by Endothermic View Post
I noticed the Guan Sheng Imaging Reflectors have a fan for the primary mirror while the Skywatcher Imaging Reflectors do not. Would that make a big difference with prime focus imaging or only afocal?
I don't know what difference it would make in a smaller optic but with my CDK17 the fans make quite a large difference. I find images are not fully sharp unless the mirror and air temp are 1C or less different in temperature.

It will assist the mirrors cooling off to ambient much faster and thats a good thing. I think it also tends to keep dew off a bit more.

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