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I have a portable AC unit at my dark site weekender house. I think I will drag it into the observatory and see if it makes an appreciable difference or if it simply accelerates dewing!
My CDK17 gets to within .1 C of ambient after about 2 hours even on a warm day and within .5C within an hour routinely. The difference in focusing is substantial. The difference between .1 and .5C is marginal but 1C is noticeable.
Greg.
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