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I know what you mean, Dave. I *think* that the waves of bulging distortion is caused by boundary layer, because on my "light bulb moment" night, where the mirror finally reached (within 0.3°) ambient temperature, that distortion stopped!
The image stood still.. still flickering from the atmospheric seeing, but not affected by the large pulsing waves.
I usually leave my fan running all the time, even while imaging at 7500mm FL.. I don't appear to get any vibrations from it, which is great.
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