The AF-S DX Zoom-Nikkor 17-55mm f/2.8G IF-ED is a high-quality zoom lens option customized for digital cameras, part of the new DX Nikkor series. Designed specifically for use with Nikon D1/D2-series and D100 digital SLR cameras, it features wide-angle zoom capability, ED (Extra-low Dispersion) glass and Nikon's exclusive built-in SWM (Silent Wave Motor). The lens is targeted at professional and advanced amateur Nikon D-SLR users who demand both the advantages of high optical performance and wideangle focal zoom range. This G-type Nikkor lens is designed with no aperture rings and offers easier, virtually mistake-free operation because the aperture does not need to be set to minimum. Equivalent focal length in 35mm is 25.5-85.5mm.