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Nippon Kogaku's 5cm f/1.1 was the fastest lens offered for any Japanese rangefinder when it arrived in the mid-1950s, and the internal mount version seen here is the original form: it seats on the body's inner bayonet and focuses through the camera's own helicoid and focusing wheel. The lens proved too heavy for that arrangement, so Nikon later rebuilt it to sit on the outer bayonet with its own mount. Wide open it draws softly with heavy vignetting, tightening quickly as it stops down.