NIKKOR-O 1:4 f=2.1cm No.220916
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- «Nippon Kogaku Japan»
- Production year 1959/60
- 806th lens produced (first 2.1cm lens was No.220111)
- 8 elements in 4 groups, picture angle 91°
- Black front ring, filter ∅ 52mm
- 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
- Small rear lens collar
- Dimensions approx. 60mm ∅ x 56mm
- Weight approx. 160g
- NIKKOR 52mm snap-on front lens cap
- NIPPON KOGAKU 3F rear lens cap
- NIPPON KOGAKU F 2.1cm viewfinder 201086
- Nikon F 52mm screw-in lens hood
- Nikon 52mm L39 screw-in filter, chrome rim
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