Sigma 50-500mm f/4.5-6.3 APO DG OS HSM Lens for Nikon

The Sigma APO 50-500mm f4-6.3 EX DG HSM Lens for Nikon Digital SLR Cameras is a high-magnification zoom lens with a 10x zoom ratio. The super coating on each glass surface produces superb color rendition, while reducing flare and ghosting. This lens uses four pieces of Special Low Dispersion glass for excellent correction of color aberration throughout the entire zoom range. The Hyper Sonic Motor provides quiet high-speed AF function, as well as full-time manual focus capability. This lens also features a Zoom Lock device to eliminate "zoom creep" when the lens is tilted down. When the lens is set to the 50 millimeter focal length, it is remarkably compact and provides easy handling. Non-rotating front lens elements, due to the rear focus mechanism, make possible the use of a custom bayonet "petal-type hood," which prevents extraneous light from degrading the image quality. This mechanism also allows the use of circular polarizing filters, since the front barrel does not rotate during focusing or zooming. This lens is available from Outdoorphoto.