Schneider-Kreuznach's Tessar-type Xenar — the 50mm f/2.8 normal in Leica Thread Mount.
The Schneider-Kreuznach Xenar 50mm f/2.8 in Leica Thread Mount is a vintage German normal built on the four-element Xenar (Tessar-type) design. Examples in screw mount let this compact standard be used on L39 and adapted rangefinder bodies; the Xenar name denotes Schneider's Tessar-type triplet-derived formula.
It is a manual-focus rangefinder-coupled lens with a 50mm focal length and a maximum aperture of f/2.8. The Xenar is a four-element Tessar-type design, which keeps the barrel compact, and in rangefinder form it couples to the camera for accurate focusing on screw-mount and adapted bodies.
Tessar-type normals like the Xenar are known for crisp, contrasty rendering that is sharp in the centre wide open and improves across the frame when stopped down. At 50mm f/2.8 the lens suits street, travel and general daylight shooting where a slim, sharp normal is welcome.
As a vintage German optic, used copies should be checked for haze, cleaning marks, coating wear and separation, and the focus and aperture tested for smooth, oil-free operation. Verify rangefinder coupling and infinity focus on any converted example. It adapts to Leica M with an LTM-to-M ring and to mirrorless cameras via an adapter.