Sigma 70-200mm f/2.8 APO EX DG HSM OS FLD Large Aperture Telephoto Zoom Lens with UV, CPL, FLD, ND4, +10 Macro Filters and Bundle for Canon EOS 1DX, 70D, 60D, 60Da, 50D, 1Ds, 7D, 6D, 5D, 5Ds, Rebel T6s, T6i, T5i, T5, T4i, T3i, T3, T2i and SL1 Digital SLR Cameras Large aperture and OS system (Optical Stabilization) allowing handheld photography even in low-light situation HSM (Hyper-Sonic Motor) ensures a quiet and high-speed auto focus FLD glass elements with performance equal to fluorite glass for compensate for color aberration Ring-type ultrasonic-type AF motor with full-time manual focusing F2.8 constant maximum aperture; F22 minimum