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01-03-2011, 09:26 PM   #1
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Sigma 17-70 f/2.8-4 OS HSM or Tamron 28-75mm f/2.8

Tamron AF 28-75mm f/2.8 SP XR ZL Di LD Aspherical (IF)
Sigma 17-70mm f/2.8-4 DC Macro OS HSM

...debating between these two lenses. Lose a bit at the wide end w/ the Tammy but w/ constant 2.8 (but does it need stopped down to retain sharpness?).
The Sigma.....I've read the in-lens stabilization is a stop or two better than my K-x in-body SR. Can't vouch for validity of that, esp at short FL's...Just looking for input on IQ comparisons, color rendering, sharpness, all that good stuff
--> this would be my walk around daily use lens.
I have my 50mm M f1.7 for low light indoors, but would like one of these aforementioned to be on the camera most of the time (indoors also, concerned about the 28mm wide end)

..roughly same price new...anyone had experience with both? I was initially looking at a Tammy 17-50, but a bit short for my needs.

Any input appreciated to further cloud my judgement. I am critically indecisive!!!!

01-03-2011, 09:45 PM   #2
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Indoors, you'll find 28mm restrictive.
If you need speed for portraiture, there is hardly anything better for a zoom than the 28-75.
I'm less enthusiastic about variable maximum aperture zooms, so don't like the Sigma and not sure if f/4 is fast enough for you at 70mm.
You'll have to make a decision.
01-03-2011, 09:55 PM   #3
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I own the Tamron 28-75, not the Sigma. The Tamron is, at least, very good wide open. I also own the Tamron 17-50mm 2.8, which is sharper wide open and @ other apertures than my 28-75. I do not know if the 17-50mm focal range will work--just throwing another idea out there.

If you can live, free of regrets, with 28mm as your wide, then get the Tammy 28-75--it really is excellent. I would disregard stabilization issues at these focal ranges.

Last edited by Jewelltrail; 01-04-2011 at 06:26 AM.

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