Canon's late rangefinder normal — 50mm f/2.2 in Leica Thread Mount, manual focus.
The Canon 50mm f/2.2 is a normal rangefinder lens made in Japan for the 39mm Leica screw thread. It appeared late in Canon's rangefinder era, near the end of the screw-mount period, offering a moderately fast fifty at a modest price. It served Leica-thread and Canon rangefinder bodies as a compact standard lens.
This is a manual-focus, rangefinder-coupled Leica Thread Mount lens with a 50mm focal length and a maximum aperture of f/2.2. The mount is the 39mm Leica screw thread (LTM / L39 / M39). Focus and aperture are set on the barrel by hand. Element count, weight and filter thread are omitted here because they are not verified from the gap data.
A 50mm at f/2.2 sits between the slower economy normals and the fast fifties, giving a natural field of view with a bit of extra speed for dimmer light and modest background blur. It is a compact, practical lens for street, travel and general use. Like most fifties of the type it firms up in the corners when stopped down slightly.
Buying used, inspect for haze, fungus and balsam separation in the cemented groups. Check the coatings for cleaning marks and wear, look for oily aperture blades, and confirm the focus helicoid is smooth. Test rangefinder-coupling accuracy on a body. It adapts well to Leica M via M39-to-M and to mirrorless using M39-to-E, M39-to-Z or M39-to-RF adapters.