The Sigma 17-35mm f/2.8-4 EX DG IF HSM is a super wide-angle zoom lens specially designed only for DSLR cameras with 1.6x crop factor. The lens features HSM (Hyper Sonic Motor) provides quiet, high-speed autofocus shooting, as well as full-time manual focus, Inner Focus System, and aspherical lens elements in the front, as well as rear lens groups. (MTF Chart) | (Download Free Lens Hood)

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