Nikon AF-S DX NIKKOR 18-55mm f/3.5-5.6G ED II Zoom Lens with Auto Focus for Nikon DSLR Cameras Measures 2.7 inches in diameter and 2.9 inches long; weighs 7.2 ounces 7-blade rounded diaphragm produces natural out-of-focus highlights Silent Wave Motor (SWM) provides accurate, quiet high-speed autofocusing 18-55mm lens with f/3.5-5.6 maximum aperture for Nikon DX-format SLR cameras ED glass element minimizes chromatic aberration for superior optical performance 18-55mm lens with f/3.5-5.6 maximum aperture for Nikon DX-format SLR cameras Silent Wave Motor (SWM) provides accurate, quiet high-speed autofocusing ED glass element minimizes chromatic aberration for superior optical performance 7-blade rounded diaphragm produces natural out-of-focus highlights Measures 2.7 inches in diameter and 2.9 inches long; weighs 7.2 ounces