Sigma 884101 F2.8-4 Contemporary DC Macro OS HSM 17-70mm Zoom Lens for Canon EF-S Cameras - International Version (No Warranty) 17-70mm focal length, 72mm filters F2.8-4 maximum aperture; F22-22 minimum Image stabilization, Compatible with Sigma's USB Dock Compatible with APS-C format DSLRs 0.22m/8.66" minimum focus