Yes this was quiet, which is fine but way to slow, 2-3 seconds to focus on a static object is pretty bad i have to say. They have ordered another and i have asked them to order in a Sigma 17-70 f2.8-4 to try just in case. PF gives the Sigma 2 pixels up.
Dave On Thu, Mar 20, 2014 at 12:38 AM, Ken Waller <[email protected]> wrote: > Without a side by side comparison I wouldn't say my 16-50 mm f2.8 D* is > significantly slower than any of my screw drive lenses. Seems noticeably > faster - and definitely quieter. > > Kenneth Waller > http://www.pentaxphotogallery.com/kennethwaller > > ----- Original Message ----- From: "Dario Bonazza" > <[email protected]> > Subject: Re: Pentax 17-70 f4 and SDM motor question > > > >> 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 > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > 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 [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
