Schneider's fast Exakta normal — the double-Gauss Xenon 50mm f/1.9 West German standard.
The Schneider-Kreuznach Xenon 50mm f/1.9 is a fast standard prime from the West German maker Schneider-Kreuznach, offered in the Exakta bayonet. The Xenon was Schneider's fast double-Gauss normal line, and the 50mm f/1.9 gave Exakta users a bright West German standard as an alternative to the East German Pancolar and Oreston. It carried Schneider's reputation for precise optics.
This is a manual-focus Exakta-mount lens with a 50mm focal length and a maximum aperture of f/1.9. It uses a double-Gauss standard optical layout, the Xenon type. The aperture is set on the barrel and coupled through the Exakta mechanism on supporting bodies. Element count, filter thread and weight are omitted here where they cannot be confirmed for the specific Exakta build.
The Xenon 50mm f/1.9 gives a bright viewfinder and shallow depth of field wide open, with central sharpness that builds on stopping down and smooth, controlled out-of-focus rendering. It is a flexible fast standard for portraits, street work and low-light general shooting. Its West German rendering leans toward clean correction and good contrast in the Schneider manner.
Used Schneider Xenon 50mm lenses appear less often than the East German standards and are priced accordingly. Inspect the glass for haze, fungus and separation, and confirm the aperture blades are dry and the ring clicks. Check coatings for cleaning marks and test the focus helicoid for smoothness. On mirrorless via an Exakta adapter it makes a capable, less common vintage fast normal.