Canon telephoto for Leica thread mount rangefinders with quality chrome construction.
The Canon 135mm f/3.5 in Leica thread mount (L39/LTM) is a telephoto lens designed for Canon and Leica rangefinder cameras. This focal length pushes the practical limits of rangefinder focusing, but paired with an accurate rangefinder body it delivers sharp results at a useful telephoto reach for portraits and candid photography.
Optical quality is good with a relatively simple but effective design that produces contrasty, sharp images. The f/3.5 aperture provides reasonable speed for a rangefinder telephoto, enabling adequate subject separation at this focal length. Canon's coating technology delivers clean images with controlled flare in most lighting conditions.
Build quality is excellent with chrome brass construction that characterises Canon's rangefinder-era lenses. The smooth helicoid focusing and precisely machined aperture ring reflect manufacturing quality that has kept these lenses functioning reliably for over sixty years. The compact barrel design maintains good balance on rangefinder bodies.
On the used market, the Canon L39 135mm f/3.5 appeals to Leica thread mount system users and Canon rangefinder enthusiasts. It offers telephoto capability within the LTM ecosystem at more accessible prices than equivalent Leica-branded optics. The L39 mount also allows adaptation to modern mirrorless cameras via inexpensive adapters.