The Nikon 28-70mm F/2.8 D ED IF AF-S lens is a solid, professional zoom lens. It features Nikon's Extra-Low Dispersion Glass, enhanced autofocus speeds, and SWM (Silent Wave Autofocus Motor). These featured coupled with the built in aspherical element and internal focusing make for a premium and optically superior experience. The lens features an all metal design which highlights it's build quality while also making it more durable. The wide maximum aperture of f/2.8 helps you tackle challenging lighting situations as well while also allowing more control of depth of field than lesser zooms.