Sigma 17-50mm f/2.8 EX DC OS HSM FLD Large Aperture Standard Zoom Lens for Canon Digital DSLR Camera

For use with smaller chip APS-c or 4/3 digital cameras only Offers Sigma's OS System (Optical Stabilization) allowing hand held photography even in low-light situation HSM (Hyper-Sonic Motor) ensures a quiet & high-speed auto focus FLD glass elements with performance equal to fluorite glass for compensate for color aberration Ultra compact with overall length of just 3.6"

• Lens Construction 17 Elements in 13 Groups Angle of View 72.4-27.9 Number of Diaphragm Blades 7 Mimi

More detail ...