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Following up on Mikes original post, it seems from my experimental data that you have to get the mirror to within 0.5C of ambient for the boundary layer currents to stop. Interestingly Damian Peach has also posted the same observations a few months ago, also claiming that the mirror had to be within about 0.5C of ambient.
The difference that it makes is very dramatic - details that were completely invisible suddenly pop out and the image as a whole becomes very stable.
cheers, Bird
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