Sigma 15mm f/2.8 EX DG Diagonal Fisheye - Sigma SA, Canon EF, Nikon F, Sony A, Pentax K Mount

The Sigma 15mm f/2.8 EX DG Diagonal Fisheye is the digital-optimised version of the 15mm fisheye, featuring improved coatings to minimise reflections and ghosting from digital sensors. It provides a 180-degree diagonal field of view on full-frame cameras, filling the entire frame with a characteristic fisheye distortion. With a fast f/2.8 aperture and very close focusing, it is a creative tool for everything from extreme sports to creative portraiture. When buying a used DG version, focus on the clarity of the front element and the responsiveness of the aperture. The AF mechanism should be tested for accuracy. SDS inspects the lens for internal dust and verifies the structural integrity of the built-in hood. We also check the barrel for any wear on the EX finish and ensure that the mount electronics are communicating correctly with modern digital camera bodies.