NIKKOR-O 1:4 f=2.1cm No.220182

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• «Nippon Kogaku Japan», production year 1959
• 72th 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 meters from 0.9m 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
• missing NIPPON KOGAKU F 2.1cm viewfinder
• missing NIPPON KOGAKU 2.1cm lens hood

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