dfa 28-105 users

**acoufap** · 05-24-2016, 01:20 AM

Originally posted by Adam

I'd say, subjectively, that the motor in the 28-105 is faster, but this is balanced out by the fact that 0.5 to 1.5 stops less light reaches the AF sensor. The latter may therefore perform a bit worse in low light (then again you'll probably be using a different lens in that situation).

Thank you!

I tried the 24-70 at a camera shop and it seemed to me that it's much faster in AF speed on the K-1 than the DA 18-135 on the K-5.

Adam · 05-24-2016, 02:04 AM

Originally posted by acoufap

I tried the 24-70 at a camera shop and it seemed to me that it's much faster in AF speed on the K-1 than the DA 18-135 on the K-5.

That's quite likely, especially if it wasn't too bright in there. The low-light performance of Pentax AF systems has been greatly improved over time, most notably through the K-5 II.

05-24-2016, 02:04 AM	#17
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	Originally posted by acoufap I tried the 24-70 at a camera shop and it seemed to me that it's much faster in AF speed on the K-1 than the DA 18-135 on the K-5. That's quite likely, especially if it wasn't too bright in there. The low-light performance of Pentax AF systems has been greatly improved over time, most notably through the K-5 II. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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05-24-2016, 01:20 AM	#16
acoufap Site Supporter Join Date: Jan 2011 Location: Munich, Germany Photos: Gallery \| Albums Posts: 4,187	Originally posted by Adam I'd say, subjectively, that the motor in the 28-105 is faster, but this is balanced out by the fact that 0.5 to 1.5 stops less light reaches the AF sensor. The latter may therefore perform a bit worse in low light (then again you'll probably be using a different lens in that situation). Thank you! I tried the 24-70 at a camera shop and it seemed to me that it's much faster in AF speed on the K-1 than the DA 18-135 on the K-5.