[Guest]

I looked again at the-digital-picture.com and have to add:

If you want to use the lens mostly wide open and/or at 50mm:

- IQ of Sigma 2,8/17-50 OS better than Tamron 2,8/17-50 (non VC)

So it's difficult to decide which one is better.

Lars





[quote name='Lars' timestamp='1301988877' post='7384']

Hi,



I am looking for a similar lens for my D7000 and have done some researches.

I found out (not my own experince):

- IQ of Sigma 2,8/17-50 OS far better than Sigma 2,8-4/17-70 OS at 50 and 70mm wide open

- all other settings: similar IQ

- IQ of Sigma 2,8/17-50 OS better than Tamron 2,8/17-50 VC

- IQ of Tamron 2,8/17-50 (non VC) better than Tamron 2,8/17-50 VC

- IQ of Tamron 2,8/17-50 (non VC) slightly better than Sigma 2,8/17-50 OS



So its up to you:

best IQ and price, but no OS/VR and suboptimal AF: Tamron 2,8/17-50 (non VC)

very good IQ, OS, very good AF, highest price: Sigma 2,8/17-50 OS

if you want to use 70mm for dreamy portraits, good price, OS: Sigma 2,8-4/17-70 OS



Lars

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