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I've usually seen the term servo to mean a motor that just runs when current is applied, rather than moving by steps in response to an impulse. The distance a servo motor move is determined by the time current is applied for, so the movements are less repeatable. Most stepper motors don't have positional feedback either, the controllers just count how many steps they have moved, although I believe some do feedback that they have moved in response to the impulse.
I'll let you know if I have any success focusing this setup with focusmax - might have more problems with the 14mm focal length than the movement of the focuser!
DT
Last edited by DavidTrap; 05-07-2013 at 09:38 PM.
Reason: Typos. Teach me for posting on an iPhone
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