The AF-S NIKKOR 14-24mm f/2.8G ED Lens from Nikon is an ultra-wide-angle zoom lens with a constant f/2.8 maximum aperture that delivers edge-to-edge sharpness and high contrast and is a staple in the kits of advanced Nikon shooters. It features Nano Crystal and Super Integrated Coating to improve light transmission and reduce the effects of ghosting and flare. Two ED (Extra-low Dispersion) elements and three aspherical lenses control chromatic and spherical aberrations and combine to enhance sharpness and contrast. Designed for FX-format DSLRs it is also compatible with DX-format cameras on which it offers the 35mm focal length equivalence of 21-36mm. The Silent Wave Motor (SWM) and internal focus system provide swift autofocus with superior accuracy and ultra-quiet operation. This G-type lens does not feature an aperture ring on the lens body resulting in a lighter and more compact lens. Aperture changes are designed to be done via the camera s command dial. A magnesium alloy build with dust and moisture-resistant sealing allows this lens to be used in inclement conditions and a built-in lens hood offers a degree of protection to the otherwise exposed front lens element.