Adam Maas wrote:

> Not always. SDM lenses hunt a lot less because they won't overshoot
> the mark, they are in effect stepper motors, and are told how far to
> turn the lens, screwdriver AF tends to overshoot more.

Are the in-body motors on the screw-drive cameras not stepper motors? 
If not, is it because steppers would be significantly more expensive? 
If that's not it, I can't imagine why you'd do anything else.

-- 
Thanks,
DougF (KG4LMZ)

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