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12-16-2010, 04:19 AM   #1
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a good upgrade from a 16-45

Hi all
I have upgrade fever and need a few ideas for a lens to replace my Pentax 16-45mm.

wish list is
2.8 A
samish focal length
as good if not better IQ
and a motorised AF would be nice...but not a deal breaker if screw drive..
must have good build quality

I was thinking a 28-70 would do me in focal length...but ive had some good uses for the wider end of the id like it to be that or 17 mm

thanks for any ideas

12-16-2010, 04:24 AM   #2
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Tommy - I'll refer to the thread below comparing the Pentax 16-50 / Tamron 17-50 and Sigma 17-50 - all are constant 2.8 lenses and any one of them would be a nice upgrade on the 16-45.
12-16-2010, 04:55 AM   #3
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Sigma 17-50, if you want the HSM.
12-16-2010, 02:05 PM   #4
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I Like My SIGMA 18-50mm f/2.8


I puzzled over the same thing for quite a while. I ended up choosing the SIGMA 18-50mm f/2.8 [SIGMA 18-50mm f/2.8 EX DC SLD ELD].

I'm not going to say that it's a slam dunk, by any means. I chose it over the TAMRON entry due to what I judged to be a better balance of IQ features relative to the TAMRON. (I spent a lot of time looking at the resolution, chromatic aberration, and performance across apertures using the online resources such as dpreview and I Chose it over the PENTAX DA 16-50 f/2.8 mainly due to cost (I was also concerned about the purple fringing issue; and I heard some reports of inconsistent build quality). The SIGMA only cost me $400 new.

I'm happy with the results. The lens is very sharp. Clearly superior for sharpness, contrast, color over the kit 18-55. My copy is a little weak on the far lefthand edge wide open up to 5.6 where it cleans up completely. Generally, this is not an issue. Where it is (usually when I'm shooting at 18mm and vertical format -- I hold the camera such that the LH edge is the foreground) I am normally shooting for DOF anyway (f/8 or greater) so the problem is colved that way.

I've been using the SIGMA for quite a while now and I really like it. It's traveled around the world with me and into some pretty harsh temp/humidity conditions with no issues.

Obviously it does not resolve as well as the limited lenses I have (40mm, 70mm, 300mm) but that is not expected. I am very happy with the sharpness up through prints to 13X19 inches. it looks great.

I may eventually pick up the DA 16-50 f/2.8. We'll see. It's not a high priority.

12-16-2010, 07:29 PM   #5
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I ended up choosing the SIGMA 18-50mm f/2.8 [SIGMA 18-50mm f/2.8 EX DC SLD ELD].
I have the prior non-SLD version and it is quite good. Got me through several vacations and day-to-day use.
12-17-2010, 12:20 AM   #6
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Original Poster
im heading towards the sigma, as I have a 70-200 HSM sigma..built like a tank and the HSM is sweet too..the IQ of the tamron is a pull, but thanks to Froggys thread I see that they have problems with QC and I may have to go through a few before I get a good one...the new sigma 17-50 with OS has the new FLD glass. and if its done the same for that lens that its done for the new 70-200 OS sigma , it should be very nice to some images taken with one..or a review with it bolted on a K7..

thanks for the help guys..much appreciated

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