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An insulating-dewshield made out of Coreflute is very effective. I did also try the car windshield cover too, but I found the Coreflute worked better after trying out both, but I guess it depends on your expectations and scope as to which you use and prefer. The Coreflute is also more rigid and less delicate than the windscreen cover - this is better for me is because I need to set up and take down the scope every session.
Below are some pics of the shield I made for my 7" Intes Mak. It does not totally stop dew formation, but it does stay dew free for more than four hours in my dew-central location at home, and most nights for even longer, and then the dew is very slow to form. The last pic shows it rolled up nice and tight for storage.
With this insulating-shield, I can take the Mak straight up to high power without needing to wait for it to reach thermal equillibrium. For a big Mak (say 7" and larger, it would take such an instrument many hours to cool down, especially if there scope is experiencing a big temperature differential between where it's been kept and the ambient temperature. Insulating the scope eliminates this need to wait for it to cool.
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