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The Sigma 17-35 mm f/ 2.8-4 EX Aspherical is a superwide-angle zoom lens for autofocus 35 mm SLR cameras of different systems.
EX series is a professional line of Sigma lenses, remarkable for its high mechanical and optic quality.
At present the Sigma 17 -35 mm f/ 2.8-F4.0 EX Aspherical is discontinued and replaced with the Sigma 17-35 mm f/ 2.8-4 EX DG HSM.