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The Leica Summicron-M 50mm f/2 Rigid Version 2 (factory code SOOIC-M) is a silver chrome rangefinder lens produced 1956–1968. It employs a 6-element in 4-group Double Gauss optical design derived from the 1951 Summicron rigid formula, featuring high-index lanthanum glass for exceptional correction of spherical and chromatic aberrations. This second version introduced the M-bayonet mount while retaining the classic rigid barrel construction. Renowned for its micro-contrast and smooth rendering, it remains one of the most sought-after 50mm Summicrons due to its limited production numbers and pure optical signature.