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I have never found the slightest need for a dual speed focuser. My
electric focuser is capable of the tiniest adjustments; cost a fraction of the price, and I don't have to touch the O.T.A. at all, so no vibrations. I did
have to put an on/off switch into the circuit to stop battery drain. [$5.00].
It's one drawback is that you can override it when using a Crayford style
focuser by manually pushing or pulling the focuser, but you can't do it
with a rack and pinion one.
raymo
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