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SOOZI is the first version of the 90mm f/2 Summicron, designed by Walter Mandler and built by Ernst Leitz Canada at Midland, Ontario, from 1957 to 1962. Records show around 490 screw-mount and 4,430 bayonet lenses, so it is far rarer than the later M versions. Six elements in five groups, a fifteen-blade diaphragm, E48 filter thread and one-metre close focus; at 660 g and 110 mm long it is a substantial lens by any measure.