Schneider Kreuznach 50mm f/1.9 Retina Xenon in DKL mount for Kodak Retina Reflex SLR. The glass has no fungus or haze. The focusing ring turns smoothly although the helix feels a little dry. The aperture tab moves smoothly and the lens stops down correctly. The lens is fairly clean cosmetically showing handling wear and someone has faintly scratched their license number in the outer ring which can be seen in the photos.