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The Leica Summicron-M 50mm f/2 Version 4 (factory code 11819), produced in Canada from 1979 to 1985, is a six-element, four-group Double Gauss optical design. This final rigid mount iteration refined the classic formula with improved coatings and mechanical precision while retaining the compact 115g weight and 0.7m close focus of its predecessors. Renowned for exceptional sharpness, smooth bokeh, and minimal flare, the 11819 remains one of the most sought-after standard lenses in the Leica M system due to its balanced performance and relative scarcity in black finish.