Nikon 17-35mm F/2.8 AFS ED-IF Nikkor Lens: The AF-S Zoom-Nikkor 17-35mm f/2.8D IF-ED is an ultra-wideangle 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.
All for edge to edge sharpness 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 SLR's, 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.