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Featuring a brand new OS and highly efficient and fast AF system, the revamped 24-70mm F2.8 Art embodies all the technical qualities and finesse that define the high-performance Sigma Global Vision Art series. Covering a wide range of shooting scenarios, the 24-70mm workhorse DNA includes three SLD (Special Low Dispersion) glass elements and four aspherical elements to reduce chromatic aberration. The 24-70mm F2.8 Art aspherical elements use Sigma's groundbreaking thicker center glass design and highly precise polishing process, delivering stunning images and bokeh effects. The lens' purpose-built structure boasts a new metal barrel for optimal durability with TSC composite internal moving components designed to resist thermal contraction and expansion. The Sigma 24-70mm F2.8 DG HSM OS Art is a premium workhorse zoom lens designed for the latest high megapixel DSLRs. A constant aperture of 2.8 through the zoom range makes this a highly versatile tool and a brand new Optical Stabilization (OS) system helps compensate for camera shake. Though a common focal length, the Sigma 24-70mm Art brings a new level of usability and durability featuring a rugged metal barrel and an emphasis on image quality. Building off the experience from the 12-24mm Art, the aspherical elements used in the 24-70mm F2.8 OS Art undergo a highly precise level of polishing, producing elements thicker in the center then on the edges. This process creates stunning image quality and beautiful circular bokeh. ...