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Order number 11819 is the black fourth version of the Summicron-M, made from 1979 to 1994. Its six element, four group design by Walter Mandler, Erich Wagner and Garry Edwards, patented in 1977, is optically the same as the version that followed, but the barrel differs: anodised light alloy with a focusing tab and a separate clip-on hood rather than the later built-in telescoping type, at about 240g. Focus runs to 0.7m, the eight-blade diaphragm stops to f/16 and filters are E39.