"The Sigma APO 70-200mm F2.8 EX DG OS HSM is the second generation of this large aperture telephoto zoom lens now incorporating Sigma's Optical Stabilization function, OS, Sigma's own anti-shake system. Two FLD glass elements, which have the performance equal to fluorite glass have also been added along with three SLD glass elements, all which provide excellent correction of color aberration. In spite of the additions of all of these features, Sigma has managed to make the lens more compact than its predecessor, measuring only 7.8"" in length. For any serious photographer where the 70-200mm focal range is often the most important second lens to own after the initial standards lens or mid range zooms. The fast aperture is extremely useful and important in low light environments or when shooting fast moving situations where a higher shutter speed demands maximum lights thru the lens. HSM ensures quiet and high speed AF as well as full-time manual focus capability. Super Multi-Layer lens coating reduces flare ghosting and assures high image quality throughout the entire zoom range. It has a minimum focusing distance of 55.1 inches throughout the entire zoom range and a maximum magnification ratio of 1:8 The rounded 9 blade diaphragm creates an attractive blur to the out of focus images. This lens is equipped with a petal-type hood. Its exceptional versatility as an all-around lens is perfect for journalists and wedding photographers. This latest|Designed for use with full frame digital SLR cameras. May also be used with smaller APS-c size sensors with a corresponding effective increase in focal length to about 100 to 300mm with most cameras|Offers Sigma's OS System (Optical Stabilization) allowing handheld photography even in low-light situation|HSM (Hyper-Sonic Motor) ensures a quiet and high-speed auto focus|FLD glass elements with performance equal to fluorite glass for compensate for color aberration"