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SOOZI is the screw-mount version of the first 90mm f/2 Summicron, a Walter Mandler design built by Ernst Leitz Canada at Midland and made from 1957 to 1962. Screw-thread examples are the scarce ones: records give roughly 490 against about 4,430 in bayonet mount. The optics are six elements in five groups with a fifteen-blade diaphragm, E48 filter thread, one-metre close focus, 660 g and 110 mm of barrel. It fits any Leica thread-mount body and adapts to M.