Thanks very much Eden, I will definitely try this! I note this behaviour should have been very clearly documented somewhere, and preferably the control software should have issued a warning or error message saying it wasn't going to rack the focuser in because it believed the focuser was already all the way in. Instead I had to ponder why focus wasn't at all improving until I switched on the lights and saw focuser wasn't moving in both direction; a heart stopping moment until I reasoned correctly what was causing this behaviour!
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