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Lars I don't live in your low temperature extremes, we drop down to -12c in Winter. What I always do is make sure if I'm taking my camera outside for the night to make sure it's not in a warm room for at least 1 hour before I go outside and when I bring it back in I leave it in a colder room for the night so there's no major temperature changes on the equipment.
I guess I'm lucky, my back room is not heated and maintains close to external temperatures and it's a good place to have my gear acclimatise, including telescopes.
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