The Sigma 8-16mm F4.five-five.6 DC HSM is the one one in all its type. That is the primary ultra wide zoom lens with a minimum focal duration of 8mm, designed in particular for APS-C size symbol sensors. It has an identical angle of view of a 12-24mm lens when used on digital camera with an APS-C size symbol sensor. Sigma’s new FLD glass components, which have the performance equal to fluorite glass, atone for color aberration. One hybrid aspherical lens and two glass mildew components give superb correction for distortion and astigmatism. An inner focusing system produces top definition photographs all over all the zoom vary and the Super Multi-Layer Coating reduces flare and ghosting whilst superior peripheral brightness ensures top contrast photographs all over all the zoom vary. HSM ensures quiet and top speed AF in addition to full-time manual center of attention capability. It has a minimum focusing distance of 9.4 inches all over all the zoom vary which permits photographers to emphasise the topic by creating exaggerated views. This lens has a compact construction with an overall duration of 4.2 inches and a most diameter of 2.9 inches and is best for shooting landscape photography, architecture, building interiors, photojournalism, wedding photography, group photos and more. Please Note Vignetting will happen if the lens is used with digital cameras with symbol sensors larger than APS-C size or 35mm SLR cameras.