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07-30-2010, 03:20 AM   #16
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QuoteOriginally posted by redeleon Quote
lets say
the

Sigma 17-70 HSM

to

Pentax SMC DA*16-50 SDM ?
No noticable different in focusing speed, at least we haven't noticed any difference on our side-by-side test. Sigma 17-70 HSM has micromotor (not ring motor), it's just as slow as Pentax's SDM.

07-30-2010, 03:43 AM   #17
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I have the 70-200 on the k20d and find it pretty quick and quiet but don't have a Pentax lens to compare it to.
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