Overview

The Sigma 15mm F2.8 EX DG Diagonal Fisheye is a compact, lightweight lens offering a 180° diagonal view and close focusing to 15cm. It delivers sharp images, especially stopped down to f/8, with good color and flare resistance. Weaknesses include visible light falloff at f/2.8 and a removable adapter ring that can cause vignetting if left on. Build quality is sturdy with smooth manual focus. Best suited for full-frame users seeking an affordable fisheye for creative perspectives; less ideal for crop sensors.