Overview

The Sigma 24-105mm F4 DG OS HSM offers excellent center sharpness, especially at 24mm, with good performance across the frame. Build quality is outstanding with metal construction, though it is heavier than Canon's version. Weaknesses include strong chromatic aberration, vignetting, and distortion. Autofocus is silent, fast, and accurate. The focus ring placement behind the zoom ring may be inconvenient. It suits photographers seeking a versatile, sharp general-purpose zoom with optical stabilization at a competitive price.