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The Leica Super-Angulon-M 21mm f/4 Version 1 (factory code SUMOM/11102) is a rare wide-angle lens produced 1964-1968 in extremely limited numbers. It employs a Biogon-type optical design with 8 elements in 4 groups, derived from the Schneider Super-Angulon large-format formula and adapted for Leica M bayonet. One of the widest production lenses for the M system before the 21mm f/2.8 Elmarit, it delivers exceptional edge-to-edge sharpness with minimal distortion. Only approximately 2,200 units were manufactured, making it highly sought after by collectors.