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Just on that subject Kevin, i have been battling heavy dew for the past few nights, with humidity over 80% and temps around 12C. I find getting the heaters started early helps alot. Of course i am in an observatory and off the ground, thus i can keep the roof closed until i am ready to start imaging, and that is a big help as well. A breeze might help delay it. I recall that Allan_l had a plan in the past to wrap his scope in a mylar rescue blanket - the idea being that it would work like a sacrificial anode and attract the condensate and spare the scope. In theory this should work because it is the cold night sky above you that causes dew to form as heat is sucked out of the scope, so a cover over it should stop heat lost. Ie the dew does not settle from the sky but condenses out of the air around you onto the scope as it loses heat to the sky. Keep the scope warm, less dew. Of course you will need power to keep the heaters going and as we see from Bretti experience, it often becomes a loosing battle as midnight approaches. Good luck on Saturday.
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