Quote:
Originally Posted by tnott
Haven't ever heard of this happening to a thick 18" primary. My 16'' has never, ever dewed up.
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It happens!! The 17.5" Coulter mirror I mentioned above sits in a classical type mirror box with no shroud around the trusses and it dewed up two nights running around 2-3am in then morning only a month ago in October. I've seen plenty of dewed secondary mirrors but this was the first time I had seen this scope dew up like that, and it wasn't even a particularly cold and dewy night.