Sigma Zoom Normal-Telephoto 50-150mm f/2.8 II EX DG HSM Autofocus Lens for Nikon Digital SLR

The Sigma 50-150mm f/2.8 II EX DC HSM lens is a compact, lightweight, large aperture telephoto zoom lens designed exclusively for digital SLR cameras. The version II of this high-quality lens has been optimized with an even better optical design, which provides optimum lens performance providing excellent correction for flare, ghosting and all types of aberrations. The super multi-layer lens coating reduce flare and ghosting and ensure sharp images throughout the entire zoom range. When used with a Nikon digital SLR camera, this lens provides an equivalent range of approx. 75-225mm (see note). DC lenses are exclusively designed for digital SLR cameras. The image circle (rear of lens) is made to match the smaller dimensions used for the image sensor on digital cameras. As a result these lenses are also more compact and lightweight, and are better matched to digital SLR cameras. Note: HSM lenses, while able to manually focus with all Nikon F-mount cameras, will autofocus ONLY with the following cameras- D1 D2-series, D40, D50, D70, D100, Pronea 6i, and Pronea S (or newer camera models). With other models, HSM or AF-S lenses must be focused manually. This is the same limitation as Nikon's own AF-S lenses. Note! Not compatible with 35mm film cameras or digital cameras using full-size image sensors (D3). Features: EX lens series denotes excellence of engineering and new technology Four SLD (Special Low Dispersion) glass elements are used for utmost correction of chromatic aberrations. The HSM (Hyper Sonic Motor) system ensures quiet and high-speed auto focusing with full time manual focus override. Compatible with 1.4x EX DG APO or 2x EX DG APO Tele Converters (optional extras). These produce a 70-210mm f/4 AF tele-zoom lens and a 100-300mm f/5.6 AF ultra-telephoto zoom lens respectively.&ref=Become