So-called pancake lenses like the Voigtlander 21mm f4 Color-Skopar are particularly popular with rangefinder and system camera photographers, offering these extremely flat-build fixed focal lengths but measured by their compact appearance top image quality.

Just 136 grams of weight and fabulous 25.4 mm overall length with a filter size of 39 mm speak for the portability of this fine wide-angle with VM connection.