Overview

The Schneider-Kreuznach Edixa-Curtagon 28mm f/4 is a retrofocus wide-angle lens from 1959, notable as the widest DKL-mount lens. Optically, it delivers very sharp center performance on full frame, though corner sharpness is not as strong as some contemporaries. Its main weakness is flare susceptibility due to poor coating. Build quality is typical for DKL lenses, with a narrow, heavy focus ring and no aperture ring; aperture control requires a special adapter. It suits mirrorless users seeking a vintage wide-angle look, especially for HDR work, but flare may be an issue in backlit scenes.