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The image shift sounds like on a newt, when you adjust at high powers, and the image wobbles about.. With rack'n'pinion focusers you can adjust the tension to make focusing smoother, but then you'll get slop in the tube.
Premium crayford type focusers get around this with fine and course focus knobs, with 8:1 or 10:1 ratio, so there's less image shift when focusing.
Alternatively, motorised focusers should keep it smooth.. does it wobble about when you use your microfocuser?
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