Sigma 70-200mm f/2.8 APO EX DG HSM OS FLD Large Aperture Telephoto Zoom Lens for Nikon Digital DSLR Camera 70-200mm focal length, Minimum Focusing Distance :140cm / 55.1inch, Maximum Magnification -1:8.FOCAL LENGTH SIMULATOR:The focal length changes the angle of view in an image. The longer the focal length, the smaller the angle of view and the greater the magnification 105-300mm equivalent focal length on APS-C cameras, 112-320mm equivalent focal length on Canon APS-C cameras.SIGMA DC lenses cannot be used with digital cameras with an image sensor larger than APS-C size or 35mm SLR, and APS Film SLR cameras. F2.8 constant maximum aperture; F22 minimum, Ring-type ultrasonic-type AF motor with full-time manual focusing Image stabilization, 4 stops claimed. Dual mode, normal and panning, 77mm filters Available in Canon EF, Nikon F (FX), Pentax KAF3, Sony Alpha, Sigma SA mounts. Dimensions (DxL) Approx. 3.4 x 7.8" (8.64 x 19.81 cm), Weight 3.15 lb (1.43 kg).