I don't think the quality of the stepper motors nor the gearing on a standard EQ3 or 4 (and possibly even the eq5)would be precise enough for deep imaging. I feel it would be more a mechanical issue rather than an electronic issue. Of the EQ3, 4 and 5 I've had I'm yet to see one of them that I would be confident with using anything longer in FL than say 400 - 500 mm to image through.
Applying this mod to an HEQ5 or EQ6 would be a different story though.
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