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Very brave with yesterday's heat. I had a small bahtinov mask with very fine slits I used for lenses but found there wasn't enough light coming in so for lens I rely on the numbers in Nebulosity fine focus feature and spend a bit of time with the mount tracking to get it as best as I can, then I tape the lens barrel so it won't move and stick a sock on it. That keeps focus for a few nights at least.
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