Canon's fast rangefinder normal — 50mm f/1.4 in Leica Thread Mount, manual focus.
The Canon 50mm f/1.4 is a fast normal rangefinder lens made in Japan for the 39mm Leica screw thread. Introduced late in the 1950s, it is one of Canon's most sought-after rangefinder standard lenses and a Gauss-type design rather than the earlier Sonnar-style fifties. It served Leica-thread and Canon rangefinder bodies as a bright everyday and low-light lens.
This is a manual-focus, rangefinder-coupled Leica Thread Mount lens with a 50mm focal length and a maximum aperture of f/1.4. 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/1.4 is a fast, versatile normal for available light, portraits and street work, giving shallow depth of field and strong subject separation. This Canon fifty is well regarded for good sharpness and pleasant rendering, tightening up notably by f/2.8 to f/4. Its natural field of view makes it a go-to general lens.
Buying used, this is a popular lens so watch the price against condition: 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, which matters most wide open. 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.