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Hi Ray,
I have had this problem at Clayton every winter since I have had an observatory there.
Have you considered having some fans on your scope running all night? My RC has fans which run all night and that keeps the dew off the primary. The secondary has a dew heater.
I typically run the fans about a couple of hours prior to imaging and opening the scope to the night air.
This seems to work well in keeping the problem at bay.
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