Nikon AF-S FX NIKKOR 17-35mm f/2.8D IF-ED Zoom Lens with Auto Focus for Nikon DSLR Cameras Please find the user manual in product details section. 17-35mm wide-angle zoom lens with f/2.8 maximum aperture for Nikon digital SLR cameras 2 types of aspherical lenses (2 molded glass and 1 hybrid) and 2 ED glass elements 9-blade rounded diaphragm achieves natural blur for out-of-focus elements Silent Wave Motor (SWM) delivers quiet and accurate high-speed autofocusing Measures 3.2 inches in diameter and 4.2 inches long; weighs 26.3 ounces; 5-year warranty