Canon's compact rangefinder normal — 50mm f/2.8 in Leica Thread Mount, manual focus.
The Canon 50mm f/2.8 is a normal rangefinder lens made in Japan for the 39mm Leica screw thread. It comes from Canon's mid-1950s rangefinder line, offering a compact standard lens between the slow economy fifties and the faster designs. It served Leica-thread and Canon rangefinder bodies as an everyday normal.
This is a manual-focus, rangefinder-coupled Leica Thread Mount lens with a 50mm focal length and a maximum aperture of f/2.8. The mount is the 39mm Leica screw thread (LTM / L39 / M39). Aperture and focus are set on the barrel by hand. Element count, weight and filter thread are not restated here because they are not verified from the gap data.
A 50mm at f/2.8 is a practical walk-around normal, small and light while giving a natural field of view for street, travel and general photography. The moderate aperture works across a wide range of light and tends to be sharp through the frame when stopped down a little. It renders cleanly in the manner of Canon's coated rangefinder normals.
On the used market, check the glass for haze and fungus and the cemented groups for balsam separation. Look over the coatings for cleaning marks and wear, test the aperture blades for oil, and confirm the focus helicoid is smooth. Verify rangefinder-coupling accuracy on a body. The lens adapts well to Leica M with an M39-to-M adapter and to mirrorless via M39-to-E, M39-to-Z or M39-to-RF adapters.