The Sigma 17-50mm ƒ/2.8 EX DC OS HSM is a compact, fast-aperture standard zoom with optical stabilization. With two FLD glass elements, one hybrid aspherical lens element and two glass-mold elements, the lens corrects for all types of aberrations.
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When Ansel Adams developed the Zone System with Fred Archer in 1940, he gave photographers a tool great for controlling their images—but only with black-and-white film, and only with view cameras, where sheets of film could be processed individually.