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Nice one Lee. My Esprit has been giving me nice round stars with no halos, which is what I was looking for in an imaging apo.
Lee, what was happening with the ambient temperature while your subs were getting softer / going out of focus?
I've noticed that I need to refocus regularly during the first half of the night at AstroFest, and I suspected thermals. After midnight when the temperature became more stable I didnt need to touch it much. If the tube is contracting with dropping temperature, it surely can't be unique to this scope.
The focus lock is a bit quirky, but as you say there's no shift. My focused doesn't slip, but then my DSLR only weighs about 500g.
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