Overview

The Sigma 12-24mm F4.5-5.6 II DG HSM is unique as the widest rectilinear full-frame zoom, offering an extreme 122° field of view at 12mm. Optically, it delivers good image quality but has no direct rival for comparison. Build quality is high with a metal mount, weather-sealing, and a fixed petal hood that protects the bulbous front element. Weaknesses include a stiff zoom ring and inability to use filters. It suits full-frame users seeking an ultra-wide perspective, especially for tight spaces.