Canon's fast rangefinder normal — 50mm f/1.8 in Leica Thread Mount, manual focus.
The Canon 50mm f/1.8 is a fast normal rangefinder lens made in Japan for the 39mm Leica screw thread. It is one of Canon's better-known rangefinder standard lenses of the mid-1950s, sold in large numbers as the everyday fast fifty for the company's screw-mount system. It served Leica-thread and Canon rangefinder bodies.
This is a manual-focus, rangefinder-coupled Leica Thread Mount lens with a 50mm focal length and a maximum aperture of f/1.8. 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 fast 50mm at f/1.8 is the classic rangefinder standard lens, giving a natural field of view with enough speed for low light and gentle subject separation. This Canon fifty is well regarded for sharpness once stopped down and a clean, natural rendering. It handles street, travel, portraits and general photography with ease.
Buying used, this is a common lens so condition should be the deciding factor: inspect for haze, fungus and balsam separation in the cemented groups. Check 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. 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.