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12-06-2009, 02:32 AM   #1
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Tamron 17-50, f2.8 or Sigma 17-70mm F2.8-4.5

HI, looking for a replacement for the kit lens on an ist* dl and on a K-7. How do these two comparably priced lenses compare?

Does the tamrons continuous aperture make it a better lens?

I much prefer the look of the sigma and the 70mm end would be useful but i would be grateful to hear some experiences on either lens.

Thanks

Fraser

12-06-2009, 03:45 AM   #2
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I would take the Tamron 17-50 just for the fixed aperture. I don't know how IQ goes but I think the 17-50 is probably going to be sharper.
12-12-2009, 04:53 PM   #3
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I had Sigma 17-7mm, I sold it, and now i do regret i did that.
It was very sharp! although colors were cold without PP.
the rendering was so so.. on 17mm it had some barrel distortions.. yet.. I still miss it and would buy it again. the range was perfect. f.2.8 was nice.
and if the new version 17-70mm f/2.8-4 will prove to be at least the same concerning sharpness and barrel distortions I plan to buy it.
12-12-2009, 08:05 PM   #4
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I saw Sigma has revised the 17-70 a bit and now includes optical stabilization (even for Pentax mount). Will Pentax's in body stabilization work with the Sigma optical stabilization? I would think this would make this lens a pretty good low light zoom if both stabilizations are working together.

12-12-2009, 09:19 PM   #5
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Optical stabilisation on Pentax mount? Where did you see this?
Pentax have optical stabilisation in the body, and their lenses therefore don't employ the technology.

As for the OP's question, it's definitely the Tamron IMO - better IQ and fixed aperture is a significant feature.
12-12-2009, 10:46 PM   #6
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QuoteOriginally posted by Ash Quote
Optical stabilisation on Pentax mount? Where did you see this?
Pentax have optical stabilisation in the body, and their lenses therefore don't employ the technology.

As for the OP's question, it's definitely the Tamron IMO - better IQ and fixed aperture is a significant feature.
It appears as though Sigma is now going to be making only optically stabilized lenses and making those of us who don't need them pay the price.
12-12-2009, 11:52 PM   #7
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QuoteOriginally posted by LeDave Quote
I would take the Tamron 17-50 just for the fixed aperture.
+1

(2,3,4,5,6)
12-13-2009, 12:02 AM   #8
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QuoteOriginally posted by reeftool Quote
It appears as though Sigma is now going to be making only optically stabilized lenses and making those of us who don't need them pay the price.
I wonder how the lens's OS collaborates with the body's SR... if this is at all true.
Doesn't sound like the stabilisation would work at all if there is any dyssynchrony between the lens and Pentax camera.

12-13-2009, 02:34 PM   #9
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I've had both. Sold the Sigma to get the Tamron. Don't regret it one bit.
12-14-2009, 11:58 AM   #10
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I have owned my Tamron 17-50 f2.8 for over a year and a half--it is usually on my K20d. I give it 2 thumbs up for sure. I never had the opportunity to shoot with the Sigma.
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