Overview

The Sigma 17-50mm F2.8 EX DC OS HSM is a well-built, compact standard zoom for APS-C DSLRs, offering a constant f/2.8 aperture and optical stabilization. It delivers sharp images across the frame, with good color rendition and fast, silent autofocus. Weaknesses include a tacky design with scratching-prone markings and a manual focus ring that spins during AF. Distortion at wide angles is minimal and correctable. It suits budget-conscious enthusiasts seeking a fast, versatile lens for portraits, landscapes, and low light.