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The Leica APO-Summicron-M 50mm f/2 ASPH (factory code 11811) is a limited-production black chrome variant of the 2004 APO-Summicron-M ASPH. Its optical construction is an apochromatic Double Gauss derivative with 8 elements in 5 groups, including two high-refractive-index glass elements, one aspherical surface, and anomalous partial dispersion glass to eliminate chromatic aberration. This remains one of the highest-performing 50mm lenses ever produced for the Leica M system, with exceptional micro-contrast and resolution across the frame at all apertures.