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Sigma has expanded their ever growing Global Vision line with the world's first constant f/2 aperture on a full-frame zoom lens, the 24-35mm f/2 DG HSM Art Lens, available here with the Canon EF lens mount. Groundbreaking aperture combined with the versatile wide-angle 24-35mm focal length allows photographers to easily replace three common lenses, the 24mm, 28mm, and 35mm, with one piece of gear.
