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Regarding focus shift when locking the focuser, most budget level focusers will do this. I experimented a few times to see which way the focus shifted, and
now defocus slightly in the appropriate direction, so that locking it brings it back into focus. You can minimise the problem by having the locking screw
partly nipped up whilst focusing, so almost all of the slop in the focuser is
taken out beforehand.
raymo
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