Originally posted by TropicalMonkey The only auto focus prime I have is FA50 so I am seriously considering DA35. Image contrast it produces look pretty good on the review page.
How noisy is DA35 while focusing? Any first hand experience please?
Hello TropicalMonkey,
I own both the DA 35mm f/2.4 and DA 50mm f/1.8, but looking at your sig, we don't share any other AF lenses, so I can't compare it directly to another lens you have. As all Pentaxians know, a screw-drive lens isn't as quiet as SDM drive, so we'll leave that out of the comparison.
The new DA's are very quiet, a slight 'whrrr' as they focus. In addition, the DA 35mm f/2.4 has a TOTAL focus throw from close-to-infinity of 1/4 turn, so in addition to not being loud, it doesn't have far to go and gets there fast. Also, there's no 'thunk' at the end, like the F series lenses.
The Fantastic Fifty has a longer MF rotation, about 5/8 turn from lock-to-lock. Still not long, it's just as fast to AF, and just as quiet as the 35.
I'd say they're slightly less loud than the FA's, much quieter than the F's. I have an F 35-70mm and it's pretty noisy. Sweet little zoom otherwise.
My FA 100mm f/3.5 Macro is considerably louder than either DA. So is my DA 16-45mm, but zooms generally make more noise, more glass to move.
Overall, my unofficial view is that Pentax AF has gotten slightly faster and quieter through the F, FA and now DA.
Not silent by any measure; But pretty good.
Ron