Overview

The Serenar 135mm f/4 II is a vintage rangefinder lens with solid build, though internal fogging and fungus are common. Optically, it produces soft images due to such issues. Handling is improved over earlier uncoupled versions via a rangefinder coupler arm, but precise focusing requires a camera with magnification like the Canon IIB. It suits collectors or enthusiasts of early Canon M-39 lenses who accept its age-related limitations.