Overview

The Sigma 10mm F2.8 EX DC HSM Diagonal Fisheye is a well-built lens with a metal body and smooth focus ring. It delivers tack-sharp center sharpness even wide open, with good corner performance for a fisheye. Flare is well controlled thanks to the built-in hood, though ghosting can occur in extreme conditions. The lens is heavy but compact, and the unique cap system may be inconvenient. It suits photographers seeking an affordable, high-quality diagonal fisheye for APS-C cameras, ideal for creative perspectives and travel.