The Sigma 17-50 OS lens is a new lens that is designed to compete with the Canon 17-55 f/2.8 IS lens and the Nikon Nikkor 17-55mm f/2.8 lens. At almost half the price of those lenses, this Sigma lens is very interesting to look at indeed. A lot of people are wondering about the quality of this lens – can it beat the Canon or Nikon? See the full, in-depth review here >> http://www.photoseis.com/sigma-17-50
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