Martin, just on the subject of bringing the camera back inside. I too have an observatory, but my practice was to never leave the camera sitting on the scope after a session. I always brought it back in the house when i locked up. Luckily for me it was easy to remove. Setups where you have focuser slide in assemblies, say like a coma corrector, or reducer/corrector setup with the camera, can be simply removed. I am also a believer in focuser dessicant plugs in my closed tube scopes, any refractor, Mak-Newt, etc. My present ED150 ASI294/Reducer assembly is a good example.
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