Overview

The Sigma 8mm F3.5 EX DG Circular Fisheye is a specialized lens offering a 180° circular image on full-frame. Optical strengths include good central sharpness and well-controlled flare, but weaknesses are significant chromatic aberration and softness at edges. Build is metal and quality plastic, though the design is dated. The removable hood adapter must be removed to avoid vignetting. It suits creative photographers or pros needing extreme distortion, but its high price and learning curve limit appeal.