NIKKOR-Q Auto 1:4 f=20cm No.178609
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- «Nippon Kogaku Japan»
- Production year 1963
- First 20cm lens was No.169211
- Picture angle 12°20′, 4 elements in 4 groups
- Built-in retractable lens hood with chrome button
- Black front ring, filter ∅ 52mm
- Lens data engraved on chrome lens barrel
- Scalopped focusing ring
- Distance scale graduated in feet from 10 ft. to infinity (∞)
- White «LENS MADE IN JAPAN» on black focusing ring («M» with slanted sides)
- No «PAT.PEND.» engraving
- Ribbed aperture setting ring
- Aperture scale f/4 to f/22, 6 iris blades
- No bayonet screws
- Dimensions approx. 73mm ∅ x 161.7mm
- Weight approx. 560g
- NIKKOR 52mm snap-on front lens cap
- NIPPON KOGAKU F rear lens cap
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