Canon's Serenar fast portrait tele — 85mm f/2 in Leica Thread Mount, manual focus.
The Canon Serenar 85mm f/2 is a fast short-telephoto rangefinder lens made in Japan for the 39mm Leica screw thread. It carries Canon's Serenar branding from the early 1950s and sits among the company's portrait-length rangefinder optics. It gave Leica-thread and Canon rangefinder bodies a bright 85mm for portraits and available light.
This is a manual-focus, rangefinder-coupled Leica Thread Mount lens with an 85mm 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 on the barrel by hand. Element count, weight and filter thread are omitted here because they are not verified from the gap data.
An 85mm is a classic portrait focal length on rangefinder cameras, giving flattering perspective and comfortable working distance, and at f/2 this lens throws backgrounds nicely out of focus. Fast short teles of this era render smoothly wide open with rising sharpness on stopping down. It suits head-and-shoulders portraits, low-light work and tighter street framing.
Buying used, 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. Rangefinder-coupling accuracy matters more at longer focal lengths, so test it carefully 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.