I bought the Sigma 17-70 2.8-4 a week ago when my Sigma 17-50/2.8 was in for repair, I quite like it. It's pretty sharp, if it's not looking great consider checking that it's actually focused, it may need some focus adjustment.
On 23 March 2014 04:14, David J Brooks <pentko...@gmail.com> wrote: > 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 <pentko...@gmail.com> 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 <pdml-m...@charter.net> 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 <pdml-m...@charter.net> 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 >>>>> 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. >>>> >>>> >>>> >>> >>> >>> -- >>> 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 > > > > -- > 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. -- Rob Studdert (Digital Image Studio) Tel: +61-418-166-870 UTC +10 Hours Gmail, eBay, Skype, Twitter, Facebook, Picasa: distudio -- 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.
