Overview

The Sigma 30mm F2.8 EX DN is an affordable, lightweight prime lens for Micro Four Thirds and Sony NEX, offering a 60mm or 45mm equivalent field of view. Optically, it delivers outstanding central sharpness wide open, with very good edges, and excellent sharpness across the frame by f/5.6. Chromatic aberration is low but some reviews note significant fringing. Vignetting and distortion are minimal. Build uses high-quality plastics and a metal mount, with a smooth focus ring but no hard stops. The linear AF motor is quick and quiet, though elements rattle when off-camera. It suits budget-conscious mirrorless users seeking a sharp, compact walkaround lens.