Canon's fast rangefinder wide — 35mm f/1.8 in Leica Thread Mount, manual focus.
The Canon 35mm f/1.8 is a fast wide-angle rangefinder lens made in Japan for the 39mm Leica screw thread. It belongs to Canon's mid-1950s rangefinder line, where the company built a reputation for fast screw-mount optics. As a bright 35mm it targeted available-light and reportage shooters on Leica-thread and Canon rangefinder bodies.
This is a manual-focus, rangefinder-coupled Leica Thread Mount lens with a 35mm 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.
At f/1.8 this is a genuinely fast 35mm for its day, giving handheld capability in low light and modest subject separation for a wide lens. Fast rangefinder wides of this era typically render softer and lower in contrast wide open, then sharpen noticeably by f/4. The 35mm view keeps its natural feel for street and interior work.
On the used market, look for haze, fungus and balsam separation in the cemented groups, all common in fast vintage glass. Check coatings for cleaning marks and wear, inspect the aperture blades for oil, and confirm the focus helicoid is smooth. Test rangefinder-coupling accuracy carefully, since fast lenses are less forgiving of misalignment. 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.