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I've had this issue a couple of times. Bits and pieces that dewed up were the bulky ones such as the mount head, dovetails, refractor tube, basically everything that had a higher thermal mass. I suspect that leaving the gear uncovered to allow it to radiate to ambient might help. On occasion I have dewed up when the gear was over-covered. So the mount was still freezing although it was warm in the tent and obviously the cold aluminium was dripping wet. Every time I had just put a thin piece of sheet over it, with good air circulation underneath I was surprised to see it completely dried by sunrise.
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