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Catalogued as SUOON 11002, this is the Leica screw-thread form of the 21mm f/4 Super-Angulon, and the scarcer of the two mounts: figures give about 1,462 in screw against some 5,292 in M bayonet. Schneider-Kreuznach made the lens for Leitz from 1958 to Guenther Klemt's nine element, four group design, covering 92 degrees, stopping in full clicks to f/22 through a nine-blade diaphragm and focusing to 0.4 m. Filters are A42 or E39, the barrel is chrome-plated brass at 250 g, and framing needs the SBKOO finder.