Riken Adler Semi (folding)

The Adler Semi folding camera, introduced by Riken in 1938, represents a typical example of the mid-range 35mm cameras available in Japan just before World War II. As a folding design, it featured a lens board that retracted into a compact body, making it relatively portable for its era. Produced for the 135 (35mm) film format, it likely aimed at amateur photographers seeking a more affordable alternative to imported German models like the Leica, though specific lens specifications and shutter details are not documented here. Its construction and features align with the practical, functional approach common to Japanese camera manufacturing of the period, focusing on reliable operation and good image quality within budget constraints.