Nikkor 1:4.5 f=5cm Nippon-Kogaku Nr.50xxx

Collapsible 5cm (50mm) 1:4.5 lens for early Canon rangefinder cameras with bayonet mount. It has the same styling and serial numbers as the 5cm 1:3.5 and 5cm 1:2.8 lenses, which suggests they were all made at the same time. It also has the same unusual aperture scale (4.5 - 6.3 - 9 - 12.5 - 18 ) as the 5cm 1:3.5. It was probably intended to be a low cost alternative to the 5cm 1:3.5, but customers favored the faster lens so only one batch was produced.
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