Canon's early Serenar fast normal — 50mm f/2 in Leica Thread Mount, manual focus.
The Canon Serenar 50mm f/2 is an early fast normal rangefinder lens made in Japan for the 39mm Leica screw thread. It carries Canon's early Serenar brand and dates from the first years of the company's postwar rangefinder lens production. As a Sonnar-influenced fast fifty it gave Leica-thread and Canon rangefinder users a bright 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. The mount is the 39mm Leica screw thread (LTM / L39 / M39). Focus and aperture are set by hand on the barrel. Element count, weight and filter thread are not restated here because they are not verified from the gap data.
A fast 50mm normal is the workhorse focal length of rangefinder photography, and at f/2 this Serenar allows handheld low-light work and a shallower plane of focus. Early fast fifties of this type render with a smooth, slightly lower-contrast look wide open that sharpens on stopping down. It suits portraits, street and general shooting.
On the used market, inspect these early Serenar fifties 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 for a faster lens. It adapts well to Leica M via M39-to-M and to mirrorless with M39-to-E, M39-to-Z or M39-to-RF adapters.