Nikon F Extension Ring Set
- production year 1959
- A Extension Ring, 5.8mm, «NIPPON KOGAKU JAPAN F», 4 bayonet screws on front side
- B1 Extension Ring, 5.8mm, «NIPPON KOGAKU JAPAN F», one single mounting point, bayonet with shallow recess, no bayonet screws
- B2 Extension Ring, 5mm, >«NIPPON KOGAKU JAPAN F», 4 bayonet screws on front side, no bayonet screws on rear side
- C Extension Ring, 10mm, «NIPPON KOGAKU JAPAN F», 52mm threads
- D Extension Ring, 20mm, «NIPPON KOGAKU JAPAN F», 52mm threads
- brown leather case, NKT-logo, early type with straight edge
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