NIKKOR-O 1:4 f=2.1cm No.220582
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- «Nippon Kogaku Japan», production year 1959
- 472nd lens produced (first 2.1cm lens was No.220111)
- Black front ring, filter ∅ 52mm
- 8 elements in 4 groups, picture angle 91°
- Aperture scale f/4 to f/16, 7 iris blades
- Infrared mark: red dot and red «R»
- Distance scale graduated in feet from 3 ft. to infinity (∞)
- «LENS MADE IN JAPAN» on chrome focusing ring («M» with slanted sides)
- «PAT.PEND.» on chrome focusing ring
- Bayonet without recess, no bayonet screws
- Large rear lens collar
- Dimensions approx. 60mm ∅ x 56mm
- Weight approx. 165g
- NIPPON KOGAKU 52mm snap-on front lens cap
- NIPPON KOGAKU 3F rear lens cap
- NIPPON KOGAKU F 2.1cm viewfinder 200596
- NIPPON KOGAKU F 52mm screw-in lens hood, «f=2.1cm 1:4»
- Nikon 52mm L38 screw-in filter, chrome rim
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