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Hi,
the step size is not a problem.
If the individual step size is 9 arc sec, then all that would be needed is to microstep the motor. lets say 64 microsteps (there are already drive systems out there that do this) and suddenly we have a .14 arc sec step size. Easily a high enough resolution to provide smooth tracking. Cant remember the actual figure, but EQ6's are significantly higher in their step size (and use microstepping as well) and no-one complains about seeing jumps in the eyepiece.....
cheers
Gary
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