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Order number 11819 is the black anodised fourth 50mm Summicron, in production from 1979 and designed by Walter Mandler with Erich Wagner and Garry Edwards, patented in May 1977. Six elements in four groups give a true focal length of 52.3mm and a 47 degree diagonal field, with 0.7m minimum focus and an E39 filter thread. Examples engraved Leitz Canada were assembled at the Midland plant in Ontario rather than in Wetzlar. Black anodised barrels weigh about 240 grams.