For many photographers, the 24-70mm focal length range is considered the standard as an everyday lens for a wide variety of subjects and scenarios, including street and reportage work, candids, travel and even intimate nature and landscape photography. The SIGMA 24-70mm F2.8 DG OS HSM | Art offers many advantages: a constant aperture throughout its range, an optical stabilization system, and outstanding bokeh effects due to its 9-blade, rounded diaphragm, 37cm (15in.) close focusing capability. The lens is dust- and splash-proof and incorporates a newly designed hypersonic motor (HSM) for fast and smooth AF operation. The lens also incorporates the latest electromagnetic aperture control for specific Nikon cameras; the Canon mount is compatible with the Canon Lens Aberration Correction function.