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Leitz built the Xenon 5cm f/1.5 from 1936 to 1950, 6,190 lenses in all, under licence from Taylor-Hobson: the design is Horace William Lee's, patented in December 1930, and uses seven elements in five groups. It was the fastest Leica lens of the pre-war years. Wide open it trades outright resolution for a glowing, low-contrast rendering that later coated designs deliberately engineered away. Catalogued as XEMOO in screw mount, LLC 124, with the XIOOM folding hood as its matching accessory.