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Nippon Kogaku introduced the W-Nikkor.C 3.5cm f/1.8 in 1956 as the fastest 35mm lens available for a rangefinder camera, a modified double Gauss of seven elements in five groups with a 43mm filter thread and a three-foot close focus. It was designed for the Nikon S bodies, and the Leica screw mount version was made in far smaller numbers, which is why it turns up so rarely. Around 7,000 were built in all before production ended in 1964.