Canon's Serenar fast normal — 50mm f/1.8 in Leica Thread Mount, manual focus.
The Canon Serenar 50mm f/1.8 is a fast normal rangefinder lens made in Japan for the 39mm Leica screw thread. It bridges Canon's Serenar branding and the well-known Canon 50mm f/1.8 that followed, sitting among the company's fast standard lenses of the early 1950s. It served Leica-thread and Canon rangefinder bodies as a bright everyday fifty.
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 not restated here because they are not verified from the gap data.
A 50mm at f/1.8 is a practical fast normal for available light, street and general shooting, with enough speed for handheld interiors and modest background blur. Canon's fifties of this line have a reputation for good sharpness once stopped down slightly, with a natural rendering. It is a versatile focal length for portraits and travel alike.
On the used market, inspect for haze, fungus and balsam separation in the cemented groups. 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. It 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.