Overview

The Schneider-Kreuznach Curtagon 28mm f/4.0 is a vintage lens originally for Kodak Retina Reflex cameras. Optically, it offers very good center sharpness 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 solid, but the aperture ring can bind with step-up rings. It suits photographers seeking compact, affordable vintage glass for adapted use, especially on mirrorless cameras, but flare control may be a concern.