The Sigma 8-16mm F4.5-5.6 DC HSM is only one of its kind. This is first ultra wide zoom lens with minimum focal length of 8mm, designed specifically for APS-C size image sensors. It has an equivalent angle of view of 12 to 24mm lens when used on digital camera with an APS-C size image sensor. Sigma’s new FLD glass elements, which have performance equal to fluorite glass, compensate for color aberration. One hybrid aspherical lens and two glass mold elements give excellent correction for distortion and astigmatism. An inner focusing system produces high definition images throughout entire zoom range and super multi-layer coating reduces flare and ghosting while superior peripheral brightness ensures high contrast images throughout entire zoom range. HSM ensures quiet and high speed AF as well as full-time manual focus capability. It has minimum focusing distance of 9.4-inch throughout entire zoom range which allows photographers to emphasize subject by creating exaggerated perspectives. This lens has compact construction with an overall length of 4.2-inch and maximum diameter of 2.9-inch and is perfect for shooting landscape photography, architecture, building interiors, photojournalism, wedding photography, group pictures and more.