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Like the SCT's the mirror moves up and down the baffle tube while changing focus.
The "slop" can be reduced by running the focuser in/ out through the full travels a few times to redistribute the grease (and reduce the "gap") on the baffle.
If the OTA is left close to the focus for any length of time (thinking about those fitted with rear Crayford additions) the grease film is reduced in this location and can result in more "slop"
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