Sigma 17-50mm f/2.8 EX DC OS HSM Zoom Lens for Canon DSLRs with APS-C Sensors
For Canon DSLRs with APS-C Size Sensors4 Stops of Anti-Shake (OS) CompensationAperture of f/2.8 throughout Zoom RangeAccepts 77mm FiltersUltra Compact (Only 3.6", 91.8mm Long)Multi-Layered Lens CoatingExcellent Correction for AberrationsHyper-Sonic Motor for Quiet/Fast AFClose Focusing Distance of 11" (28cm)Weighs Only 19.9 oz (565 g)