Rollei-Mutar 0.6× Wide-Angle Converter / Auxilliary Lens For Rollei 16S
Rollei-Mutar 0.6× Wide-Angle Converter Lens for Rollei 16, made by Carl Zeiss (Germany). It attaches to the front of the fixed 25mm f/2.8 Zeiss Tessar, reducing the focal length by a factor of 0.6× to approx.