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Old 3rd November 2014, 04:18 PM
neilL neilL is offline
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Join Date: Mar 2010
Member of: NOFTC CRPC
Location: Oxford
Posts: 576

I don't think you are waiting long enough. Bit more than a 2mins clock but this explains how long

Much easier to heat a scope than cool it. Astronomers do it in the dark.
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