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Not sure - the MAK is in a astro lab and temperature is pretty constant during the day. Although focus seems very sharp when you have a quality eye piece in the MAK - focusing on the DSI is laborious. Even with the gain turned right down I might describe what I see as blooming - a white, bright central dot - surrounded by a haze. ANt this is the same from an hour after sunset to 4 hours later - so I expect heat isn't the key factor - maybe its collimination?
Of course cloud cover doesn't help any - and to date with all the cloud cover I am focused on minute improvements to alignment and tracking - I'm a one problem at a time kinda guy if I can prioritise things.
Life should be eaiser when imaging something faint - funny that its the bright stars causing me grief!
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