Sigma 28-70mm f/2.8-4 DG Aspherical Large Aperture  Zoom Lens for Canon SLR Cameras Large f2.8 aperture at 28-millimeter focal length; 6.5x zoom magnification Minimum focusing distance of 19.7 inches Multilayer lens coating and design reduce flare and ghost High image quality through entire zoom range with aspherical lens element For Canon 35mm and digital SLR cameras; supplied lens hood blocks out extraneous light