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Nikon 17-35mm f/2.8D ED-IF AF-S Super Wide Angle          AF-S Zoom-Nikkor 17-35mm f/2.8D IF-ED is an ultra-wide-angle zoom lens that offers a range of professional-level features for overall superior performance. In addition to boasting the shortest closest-focusing distance in its class — 0.28m (0.9 ft.) throughout the entire zoom range — the lens also features a fast constant maximum aperture of f/2.8 at all focal lengths. It is ideal for photojournalism and general professional-level photographic needs This new lens also features Nikon's exclusive built-in Silent Wave Motor for ultra-fast, ultra-quiet autofocus operation, as well as ED (Extra-low Dispersion) glass and aspherical lens elements in a new optical design. Other features include M/A mode, which lets users switch quickly from automatic to manual focusing, even during AF servo operation, with virtually no time lag. Plus, the lens drive operation consumes no power during manual focusing Used with Nikon's Professional D Series Digital SLRs, the image reproduction ratio will be identical to that of a Nikon 35mm SLR, but for the 23.7mm x 15.6mm CCD, the lens' effective coverage will be equivalent to using a 25.5mm to 52.5mm zoom on 35mm (135) film format Features Nikon's exclusive Silent Wave Motor for swift and quiet autofocus operation with the current SLRs Two types of aspherical lens — molded-glass (two elements) and hybrid — minimize distortion at the periphery Constant maximum aperture of f/2.8 at all focal lengths. Two ED (Extra-low Dispersion) glass elements minimize chromatic aberration, provide higher resolution and superior contrast High-performance Nikon Super Integrated Coating offers superior cooler reproduction, while minimizing ghost and flare Rounded diaphragm opening (9 blades) makes out-of-focus elements appear more natural. 0.28m (0.9 ft.) closest focusing distance throughout the full zoom range. IF (Internal Focusing) permits fast AF operation and a closer focusing distance M/A mode enables instant switching from autofocus to manual focus, even during AF servo operation, with virtually no time lag. Easy-to-use design with simulated leather finish for superior grip No power is required for manual focusing which is smooth, fluid and easy Filter attachment does not rotate during focusing and zooming Dedicated lens hood effectively minimizes stray light Dust- and water drop-resistant design Specifications Construction 10 Groups/ 13 Elements 2ED Angle of view 104°-62° F stop range 2.8-22 Closest Focusing Distance 1 ft. Maximum Magnification 1:8.9 Filter Size 77mm Dimensions (Length x Diameter) 6.4 x 5 " Weight 26.3 oz. Notes ED glass element, Internal Focusing