Nikon F Extension Rings Model K
- production year 1963
- K1 Extension Ring, 5.8mm,
«Nikon F JAPAN»,
4 bayonet screws on front side
- K2 Extension Ring, 5mm,
3 mounting points,
no bayonet screws
- K3 Extension Ring, 5.8mm,
4 bayonet screws on front side,
no bayonet screws on rear side
- K4 Extension Ring, 10mm
- K5 Extension Ring, 20mm
- brown leather case, NKT-logo
- instructions (38.11.C)H
- original makers box
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