Sigma 17-50mm F2.8 EX DC HSM OS (NEW)

Sigma AF 17-50mm f/2.8 EX DC HSM OS equivalent full format focal length and aperture (depth-of-field) 27-80mm f/4 Elements/Groups 17/13 Special Elements 2x FLD + 2x aspherical Image Stabilizer Efficiency (official) 4 f-stops Aperture blades 7 (circular) Min. focus (magnification) 0.28m (1:5) AF motor HSM (ultrasonic) without FTM Size 83x92mm Weight 565g Filter size 77mm  See More..