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Sony 16-50 2.8 vs Sigma 17-70 "C"

Started Mar 5, 2014 | Discussions thread
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Sony 16-50 2.8 vs Sigma 17-70 "C"
Mar 5, 2014

I'm looking to upgrade from the kit lens on the a57 and am considering Sony's 16-50mm and Sigma's 17-70 "C" lens.  Any thoughts on the two?  I looked at a couple reviews online and it seems like they are both similarly sharp when comparing them at the same focal length and aperture, but the Sigma looks a little sharper wide open (which, of course, is slower than the Sony at the longer end).  Both have the SSM/HSM focusing mechanism.  Given all this, it seems like my decision really boils down to whether I want the faster apertures on the long end of the lens in the Sony or the greater reach of the Sigma.  (I know the Sony is also weather sealed, which might be nice to have at some point but my a57 is not and I don't plan on upgrading cameras any time soon.)

I've also looked at the Sigma 17-50 2.8 a little bit.  It too has the HSM motor and seems slightly sharper than the Sony 16-50 at 2.8, but the Sony seems to have it beat once stopped down.

Any advice anyone has would be much appreciated.

 ERN812's gear list:ERN812's gear list
Canon PowerShot SX230 HS Sony SLT-A57 Sony DT 18-55mm F3.5-5.6 SAM Sony DT 16-80mm F3.5-4.5 ZA Carl Zeiss Vario-Sonnar T* Sony DT 55-300mm F4.5-5.6 SAM +3 more
Sony SLT-A57
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