had a look at the Sigma 17-70 2.8-4 and the Pentax 17-70 4 today. The Pentax unit was much much faster than the last unit for AF, about on par with any of my other lenses but much quieter. The Sigma was $100 more and offered a 7 year warranty and f2.8 at the wide open end, and AF was faster than the Pentax but i decided to go with the Pentax. The sharpness looked a bit nicer, is lighter and the focus ring moves the correct way. LOL
I have till Tuesday when he send the Sigma back if i change my mind Time will tel Dave On Fri, Mar 21, 2014 at 1:59 PM, David J Brooks <[email protected]> wrote: > Thanks for taking the time Mark C. > > The lenses are in to inspect. Salesman tested both lenses on what ever > Pentax DSLR they have. Says the Pentax is better than the first one, > but the Sigma i =s much faster on the AF than the Pentax. > > Time will tell Saturday > > Dave > > On Thu, Mar 20, 2014 at 8:44 PM, Mark C <[email protected]> wrote: >> I tested the 17-70 on my K-5. It was a *little* slower but I don't think >> that I would have noticed if I had not been counting. The one thing I >> noticed if that if the camera failed to achieve a focus lock and then I >> tried to focus on a new subject, it took 1 to maybe 1.5 seconds to get a >> lock. What I mean is - if I pointed it at a plain white wall the camera >> often would not lock at all and just stop hunting after a short while. If I >> then switched to a subject with high contrast elements it would take a >> second or so to focus - longer than if I manual defocused the lens before >> testing. >> >> I tried the lens on the K-01 and it consistently took about 2 seconds to >> focus - no delay in the lens starting to search for the focus point, but it >> moved slowly and generally took a couple of seconds to lock in. >> >> Just for fun I tried it on a K-10d and it routinely took 1-3 seconds to get >> a lock, but it was surely the body's fault. The lens was hunting all the >> time. >> >> It was interesting to compare the K-3, K-5< K-10 and K-01. Without a doubt >> the K-3 blew all of the others away and I don't recall any shots when the >> camera indicated the shot was in focus when it was not. I had a few issues >> with the K-5 and many with the K-10. The K-01 was very accurate but very >> slow. >> >> Hopefully the new lens will fix the problem you experienced. >> >> Mark >> >> >> >> On 3/20/2014 1:25 PM, David J Brooks wrote: >>> >>> On Thu, Mar 20, 2014 at 12:59 PM, Mark C <[email protected]> wrote: >>>> >>>> Hi David - >>>> >>>> I just tested my 17-70 @ 50mm indoors in dim light on a K-3. I tried >>>> counting off the seconds "one-thousand-one..." but never got beyond >>>> "thous...." usually stopped a "one..." I can try it on a K-5 tonight, but >>>> mine is very fast. And quiet. >>> >>> Pleas do Mark if you can. The copy i tried started to slowly focus >>> after 3 thousand so it probably took 2 one thousands.:-)Wehn the rep >>> was trying i could see the focus ring ever so slowly moving, then bamo >>> it was in focus. >>> >>> Dave >>>> >>>> Mark >>>> >>>> >>>> On 3/19/2014 6:17 PM, David J Brooks wrote: >>>>> >>>>> 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. >>> >>> >>> >> >> >> -- >> 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 -- 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.
