On Thu, Mar 20, 2014 at 1:08 PM, P.J. Alling <webstertwenty...@gmail.com> wrote: > Most reviews of that lens seem to indicate that it focuses pretty fast, so I > think there's probably something wrong with the copy you've got. I'd go > back to the store and exchange it.
The copy they had never made it out of the store PJ, they are getting another in. Rep says warhouse has a lot so hopefully the second one ois better. Dave > > > On 3/20/2014 12:54 PM, David J Brooks wrote: >> >> 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 <kwal...@peoplepc.com> 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" >>> <dario.bona...@virgilio.it> >>> 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 >>> 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. >> >> >> > > > -- > A newspaper is a device for making the ignorant more ignorant, and the > crazy, crazier. > > - H.L.Mencken > > > > -- > 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.
