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On the subject of dew, I have been battling dew on the primary of my 14" dob of late. Not when I'm observing, but in the wee hours of the morning when it's stored in my observatory. The dew has been making quite a mess of my primary (now cleaned). I recently put a couple of cork tiles in the bottom of my rocker box, and put a reptile heating mat on them to radiate just a bit of warmth into the lower tube assembly. Problem solved. I leave it on a timer so that it keeps my primary just a tad warm in the late evening through to the next morning at 11am. If I'm observing, I set up before the timer kicks in anyway - so no cooling down problems.
Dean
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