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04-03-2011, 02:14 PM   #16
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Tamron 17-50 f 2.8

I was in your shoes--I did a LOT of research--I bought the Tamron--It made me very happy. Here are a few with it:











04-03-2011, 03:02 PM   #17
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FYI, just did a comparison of the Tamron 17-50 vs. Sigma 17-50 on another thread in the K-5 section.

https://www.pentaxforums.com/forums/pentax-k-5-forum/133097-k-5-sigma-17-50mm...-os-hsm-4.html

IMO, the Sigma is a better performer. Too chunky for my taste though. HSM motor is fast and quiet. But the Tamron AF was about just as fast, but painfully noisy. The AF on Tamron was not accurate at 17mm and 50mm at F2.8 though, in my copy of the lens.
04-04-2011, 07:16 AM   #18
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yesterday i went to the store and comapared on camera a pentax 17-70 f4 to tamron 17-50 f2.8, tamron was overall better but pentax took few but so so sharp pics, but i was thinking more tamron, but now hehe i would like sigma, but its 700, thats 200 more than tamron, so maybe 200 more and get pentax star ? or save 400 and stay with tamron lol hate having such a close match
04-04-2011, 09:20 AM   #19
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I'm still in favour of the Tamron over the Sigma. I'm a Sigma fan, like and own many of their lenses. But I earn my income from shooting and after using the 3, 16-17 to 50mm choices discussed, for me the Tamron was thewinner. I find it sharper particularly at f2.8. Personally I don't care about a little screw drive noise and it's never once interfered with my shooting. The Tamron AF is fast and accurate. The added bonus is this is the cheapest option but not the reason I own this lens.

04-04-2011, 09:34 AM   #20
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I'm sorry, I just realized that the Sigma lens you looked at was the 17-50mm/2.8 HSM OS and I've never tried that lens. I was referring to the 18-50mm/2.8 Macro I had. So I can't compare the 2 lenses. From Armanius's test on the other thread, it seems this might be an even better lens or he had a bad copy of the Tamron (mine seems to perform better than his results).

So to revise my comments, I'd go buy the Tamron and use it for a couple of days. See what you think of it. As long as the store has a solid exchange policy, then swap it for the new Sigma and use it for a couple days. Then decide for yourself. No matter what, don't buy the DA*.
04-04-2011, 09:58 AM   #21
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QuoteOriginally posted by Armanius Quote
FYI, just did a comparison of the Tamron 17-50 vs. Sigma 17-50 on another thread in the K-5 section.

https://www.pentaxforums.com/forums/pentax-k-5-forum/133097-k-5-sigma-17-50mm...-os-hsm-4.html

IMO, the Sigma is a better performer. Too chunky for my taste though. HSM motor is fast and quiet. But the Tamron AF was about just as fast, but painfully noisy. The AF on Tamron was not accurate at 17mm and 50mm at F2.8 though, in my copy of the lens.
Armanius:

Thanks for the work. To be honest, I am skeptical of the results though, because this kind of testing requires experience and precision. Some of the Tammy shots look out of focus. I took over 15,000 shots with my Tamron 17-50, before I sold it. Photozone results show Tamron 17-50 better than Sigma 17-50 wide open. Photozone, who is very experienced with lens testing, has this warning they provide at their site:

"Please be aware that this analysis REQUIRES an absolutely perpendicular setup and this is the problem. If the setup is sub-optimal you run into simply out-of-focus scenarios that are no indication for a problem whatsoever. This is specifically a problem with fast lenses (f/2.8 and faster) where the DOF is extremely shallow wide-open."

I do think both lenses are excellent, but would not pay extra for image stabilization when I already invested in Pentax SR bodies. Also, a user here reports, though I have not seen any confirmation, that an owner of an OS Sigma lens can damae it simply by forgetting to turn off the OS when switching lenses. Can someone else confrim this? Is it with all their OS lenses, or only a select few? Thanks.

Last edited by Jewelltrail; 04-04-2011 at 11:31 AM.
04-04-2011, 12:17 PM   #22
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QuoteOriginally posted by Jewelltrail Quote
Armanius:

Thanks for the work. To be honest, I am skeptical of the results though, because this kind of testing requires experience and precision. Some of the Tammy shots look out of focus. I took over 15,000 shots with my Tamron 17-50, before I sold it. Photozone results show Tamron 17-50 better than Sigma 17-50 wide open. Photozone, who is very experienced with lens testing, has this warning they provide at their site:

"Please be aware that this analysis REQUIRES an absolutely perpendicular setup and this is the problem. If the setup is sub-optimal you run into simply out-of-focus scenarios that are no indication for a problem whatsoever. This is specifically a problem with fast lenses (f/2.8 and faster) where the DOF is extremely shallow wide-open."

I do think both lenses are excellent, but would not pay extra for image stabilization when I already invested in Pentax SR bodies. Also, a user here reports, though I have not seen any confirmation, that an owner of an OS Sigma lens can damae it simply by forgetting to turn off the OS when switching lenses. Can someone else confrim this? Is it with all their OS lenses, or only a select few? Thanks.
For whatever it's worth, I did take more than one photo each with the Tamron wide open on F2.8 at 17mm and 50mm. They were all off focus. When I used live view at 17mm, they were on focus. At F5.6 and F.8, they were on focus too. At 22mm and 35mm, they were on focus at all apertures, although at 22mm F2.8 and 3.2, it was a little softer.

If I have to guess, I probably have a bad Tamron lens.

The most compelling thing about the Sigma is the HSM motor. Very quiet and smooth. Is it worth an extra $200+? Only the user can decide.
04-05-2011, 03:14 AM   #23
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I recently purchased the Sigma 17-50mm F2.8 OS HSM. The HSM is quiet and fast. I don't use the OS. The image was shot at 50mm @ 2.8

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04-05-2011, 09:18 PM   #24
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I can vouch for the Tamron 17-50. The sigma 17-70 is actually a pretty good all-rounder. Consider it a 3.5-4.5 because the 2.8 goes really early. I think the Tamron is, well, smoother in its imagery. The Sigma can get a little nervous. Probably the bokeh difference. I've since sold them off, but doing it again, I'd get the Tamron. The Pentax is nice when I've tried it but there seem to be some strong opinions about it around here. ;-)
04-05-2011, 09:40 PM   #25
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I remember Tammy 17-50 is at $400 range.
04-06-2011, 03:15 PM   #26
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100 bucks doesnt make a difference, 200 wont, i want one to be happy with, not a regret taht i could spend 100 more for better, but ive decided, to go for tamron, just not sure should i buy the ebays one from canada for 380 or go to bh and go for 480 and have a chanse to exchange it for sigma if i dont like it.
04-06-2011, 06:04 PM   #27
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QuoteOriginally posted by fafo13 Quote
100 bucks doesnt make a difference, 200 wont, i want one to be happy with, not a regret taht i could spend 100 more for better, but ive decided, to go for tamron, just not sure should i buy the ebays one from canada for 380 or go to bh and go for 480 and have a chanse to exchange it for sigma if i dont like it.
I think Adorama has them for about $430 after the rebate. Adorama also has a 30 days return policy vs. 15 days for BH, in case you want to try the Sigma.
04-13-2011, 02:14 PM   #28
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after having tamron 17-50 for few days i went to exchange it for 17-50 sigma and omg what a difference, sigmas focus is much much better ( actually returned tamron cause in low light scenes fail to lock up at anything) and nice juicy contrast, plus it kind of quiet and heavy ! but i fall in love form a fisrt shot, next person loooking tamron vs sigma, start with sigma, ok kktnxbye going to play more with it !
04-13-2011, 03:14 PM   #29
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QuoteOriginally posted by fafo13 Quote
after having tamron 17-50 for few days i went to exchange it for 17-50 sigma and omg what a difference, sigmas focus is much much better ( actually returned tamron cause in low light scenes fail to lock up at anything) and nice juicy contrast, plus it kind of quiet and heavy ! but i fall in love form a fisrt shot, next person loooking tamron vs sigma, start with sigma, ok kktnxbye going to play more with it !
Congrats on your Siggy!
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