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The Leica Summicron-M 50mm f/2 Rigid Version 2 (factory code 11818) is a double Gauss type lens with 6 elements in 4 groups, produced 1956–1968. This second version features the updated focusing mount with the distinctive large knurled ring and retains the classic rigid barrel construction. The example has been professionally factory-repainted to original Leica black enamel finish. One of the most significant post-war Leica lenses, it established the benchmark optical performance for 50mm f/2 photography.