Sigma 50-150mm f/2.8 EX DC HSM II Zoom Lens for Nikon Digital SLR Cameras Compact, lightweight, large-aperture telephoto zoom lens Super multi-layer lens coating assured high image throughout the entire zoom range Ensures high image quality at the minimum focusing distance of 100cm/39.4 Equipped with HSM (Hyper Sonic Motor) with full-time manual focus override Lens Construction - 18 Elements in 14 Groups