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The Leica Noctilux-M 50mm f/1 Version 1 (factory code 11821), introduced in 1976 and produced until 1978, totals 17,535 units. This extremely rare aspherical large-aperture lens employs a modified Double Gauss optical design with 6 elements in 4 groups, including two hand-ground aspheric surfaces on the front element pair. The f/1 maximum aperture made it the fastest 50mm production lens of its era, delivering exceptional low-light performance with pronounced but controlled spherical aberration at full aperture.