B003A6NTIG Sigma 17-50mm f/2.8 EX DC OS HSM FLD Large Aperture Standard Zoom Lens for Pentax Digital DSLR Camera

Make sure this fitsby entering your model number.
For use with smaller chip APS-c or 4/3 digital cameras only
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″