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Thanks Mike and Dennis for your comments.
Dennis, I first had the primary dew up over 12 months ago when I cooled the OTA too much, and continually it would dew up very easily; there must have been damp air that got into the OTA. I opened the OTA and cleaned the primary and corrector, then the problem went away till last month.
Last month I cooled the OTA and it got to 5 degrees below ambient and it dewed up again. Seems to me when the internal gets below the dew point that moisture is sucked into the OTA, (I am only guessing here). The OTA is open where I have 2 fans mounted on the rear of the OTA, so I may have to cover these.
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