Sigma 70-200mm f/2.8 APO EX DG HSM OS FLD Large Aperture Telephoto Zoom Lens for Canon Digital DSLR Camera - International Version (No Warranty) 70-200mm focal length, 77mm filters 105-300mm equivalent focal length on APS-C cameras, 112-320mm equivalent focal length on Canon APS-C cameras F2.8 constant maximum aperture; F22 minimum, 1.40m/55.12" minimum focus Ring-type ultrasonic-type AF motor with full-time manual focusing Image stabilization, 4 stops claimed. Dual mode, normal and panning