Focus accuracy : Sigma 17-50mm f/2.8 or Canon 17-55mm f/2.8 ?

Started Sep 11, 2012 | Discussions thread
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yoms
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Focus accuracy : Sigma 17-50mm f/2.8 or Canon 17-55mm f/2.8 ?
Sep 11, 2012

Hello,

I had many problems with focus accuracy with my previous lens and want to buy a standard zoom with constant f/2.8 aperture.

I know the Sigma received good reviews (including DxO) and is cheaper than Canon's counterpart.

But I prefer better focus performance over resolution. So, in the field and considering focus accuracy ONLY, which one is best on a 50D : the Sigma 17-50mm F2.8 EX DC OS HSM or the Canon EF-S 17-55mm f/2.8 IS USM ?

Thank you for replies,

Canon EOS 50D
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