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The Leica Super-Angulon 21mm f/3.4 (factory code 11103) is a rare wide-angle lens produced in Wetzlar, Germany, from 1964 to 1974. It employs a Biogon-type optical design with 8 elements in 4 groups, derived from the Schneider Super-Angulon formula and adapted for Leica M rangefinder coupling. This compact lens delivers exceptional edge-to-edge sharpness and minimal distortion at f/3.4, making it one of the widest non-fisheye optics available for the Leica M system during that era. Only approximately 3,200 units were manufactured.