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Leitz built the rigid Summicron almost entirely for the M bayonet, but a small run went out in Leica screw mount between 1960 and 1963. Dennis Laney's collector guide records about 1,160 of them, against roughly 119,500 rigid and dual-range lenses in total, which makes the screw version one of the scarcer post-war Leitz normals. Optically it is the standard rigid: seven elements, ten-blade diaphragm, E39 filter thread and one-metre focus in a chrome barrel.