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Guy's I am going off thread a little but, its to do with tube currents. Myself and a friend have noticed when we put white light solar filters over the end of our dobmounted newtonian reflectors - the seeing and lack of tube currents even when the outer tube is being heated by the sun, compared to most night time problems, there is a significant average initial difference in steadiness for day time use. We assumed that it is because its sealed from airflow that this is the case maybe - so no movement inside to out and vice verca. We wondered just out of curiousity wether getting the same sort of clear plastic they use for these astronomical use white light/mylar without the coating on it and using it for night time use - it would have to be of amazing light transmission of course tho? Also see it sometimes when you stop down the aperture with a mask a little bit too.
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