At a glance, the Sigma 17-50mm f/2.8 EX DC OS HSM appears to offer most of the same advantages as its Canon and Nikon APS-C format f/2.8 counterparts, but at less than half the price. It features optical stabilization as well as having an aperture rating of f/2.8 that remains constant throughout the zoom range. It’s quite small and lightweight, and feels pretty robust, but the main difference lies beneath the skin.

Sigma 17-50mm f2 8 EX DC OS HSM review
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