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"Focus was sustained, with no change, till the last frame came in at 04:02 in the morning. The temperature change during this 10 hour stretch was ~ 14 C degrees (from ~ +12 C down to ~ -2 C)."
I have to say I am somewhat skeptical of this claim. Bert another Rh200 user on this forum has gone to great lengths to control the temperature of his scope. Keeping an f3 optical system in focus over a 14 degree temperature shift would be a spectacular design and engineering feat. If the design does allow this then kudos, other manufacturers like takahashi and AP have got a lot to learn.
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