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I realised when I put the scope away, I was wrong about the dew, it was on the secondary not the primary, hard to tell in the dark with all thsoe reflections! As the secondary is flat is it more tolerant to warming, i.e. using a hairdrier? Presumably as soon as it cools right down again it'll get dew on it though?
I never understood the hairdrier thing, surely it's going to leave all sorts of air movement, for a while after it's removed and the sides of the tube will warm up and cause more air movement, or doesn't that happen? If not, why not? Also, once everything has settled back down again, doesn't the dew re-form?
Thanks for the tip about the tube extension, I will give it a try.
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