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Thanks Greg for the tip. I would hazzard a guess and suggest that this particular issue is more extreme during the the summer months. Would that be correct? Day time temps at my observatory during winter are pretty stable as we are close to the ocean. Night time the temperature usually drops around 5 degrees at most so cooling should happen pretty quickly but I reckon cooling for an hour would be best. I gather you have dew control in place?
Allan, I don't know. This thing is pretty big. It is 860mm long and 370 mm wide. That makes for a pretty large sail in the wind. Even a slight breeze will create havoc for guiding with the G11. Added to that; 22kg combined with finder scope, camera and cables and you are nearly at the 25kg payload of the G11. It might be ok in an observatory and mounted on a G11 but it would be a punt to try it. Mind you as you say there are plenty of examples of large scopes being on top of lesser mounts.
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