Sigma 17-50mm f/2.8 EX DC OS HSM FLD Large Aperture Standard Zoom Lens for Canon Digital DSLR Camera 4.2 out of 5 stars CONSUMER REVIEWS(125) For use with smaller chip APS-c or 4/3 digital cameras only Offers Sigma’s OS System (Optical Stabilization) allowing handheld photography even in low-light situation HSM (Hyper-Sonic Motor) ensures a [...]
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