Canon's Serenar fast normal — 50mm f/1.5 in Leica Thread Mount, manual focus.
The Canon Serenar 50mm f/1.5 is a fast normal rangefinder lens made in Japan for the 39mm Leica screw thread. It carries Canon's Serenar branding and belongs to the family of Sonnar-derived fast fifties the company produced in the early 1950s. It gave Leica-thread and Canon rangefinder users a bright standard lens for low light.
This is a manual-focus, rangefinder-coupled Leica Thread Mount lens with a 50mm focal length and a maximum aperture of f/1.5. 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 not restated here because they are not verified from the gap data.
At f/1.5 this is a proper fast fifty for available-light photography, giving shallow depth of field and handheld capability in dim conditions. Sonnar-type fast normals of this era are known for smooth rendering and a soft, glowing quality wide open that sharpens on stopping down. It suits portraits, street and low-light general work.
On the used market, inspect for haze, fungus and balsam separation in the cemented groups, which are common in these fast Sonnar-type designs. Check the coatings for cleaning marks and wear, look for oily aperture blades, and confirm the focus helicoid is smooth. Verify rangefinder-coupling accuracy on a body, which is critical wide open. 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.