Could be, i mostly tried it at 650-70 length. It was and i', m not exagerating at least 2-3 if not more seconds to focus. You could see it in th efinder getting closer and closer and hey there ist in focus. Not sure i want something i need to just hold and hope.
Dave On Wed, Mar 19, 2014 at 6:31 PM, Dario Bonazza <dario.bona...@virgilio.it> wrote: > Well, the DA* 50-135mm SDM is probably the slowest AF lens on Earth, gaining > it the nickname of "the sloth". Generally speaking, SDM lenses are slower > than both screw-driven ad DC Pentax AF lenses, so the DA 17-70mm is a good > candidate for being another slow-AF lens. However, I own it and I don't find > it THAT slow as you pointed out. > There is however another problem I saw on several samples of that lens and > is the almost impossibility to autofocus above 50mm focal length, hunting > forever while you try & find the focus. Perhaps that's the problem you > spotted. > > Dario > > -----Messaggio originale----- From: David J Brooks > Sent: Wednesday, March 19, 2014 11:17 PM > To: Pentax Discuss > Subject: Pentax 17-70 f4 and SDM motor question > > > Hi all > > I went to pick up above mentioned lens this afternoon. loks and feel > nice on the K-5, however me thinks there is a problem. > I know the AF of Canon and Nikon are quite fast leaving us Pentaxians > hunting and pecking our way through landscapes and soccer photos, BUT, > 2-3 seconds to lock on and focus on a static object.?? Me thinks > that's a bit to slow. > The salesman and i played with it for 10-15 minutes. It did get a tad > faster to focus but it was still painfully slow. I know it will not be > as snappy as my Nikon 70-200 f2,9 VR lens, you can barely hear > anything and it locks on faster than Mike Johnson deleting a cat > photo. > > So, am i missing something with this SDM system. Is it painfully slow > or should it be as fast or faster to AF on a subject as the screw > focus lenses. Do i need to adjust a menu setting or something. > > Another is on order for Saturday > > Dave > > -- > Documenting Life in Rural Ontario. > www.caughtinmotion.com > http://brooksinthecountry.blogspot.com/ > York Region, Ontario, Canada > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > > > ----- > Nessun virus nel messaggio. > Controllato da AVG - www.avg.com > Versione: 2013.0.3462 / Database dei virus: 3722/7216 - Data di rilascio: > 19/03/2014 > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. -- Documenting Life in Rural Ontario. www.caughtinmotion.com http://brooksinthecountry.blogspot.com/ York Region, Ontario, Canada -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
