This sample circa '73.
Filter size: 52mm
Close focus distance: 1 foot or .3 meters. The AI-S version: 9 inches or 0.25 meters.
Aperture range: f/2 - f/22
Aperture blades: 7
Depth of field scale for f/4, f/8 - 16, plus IR focusing index.
Design: 9 elements in 7 groups
Has close range correction. All versions are multicoated whether or not they are engraved with a C. Older versions marked Nippon Kogaku are pretty rare, about 3000 made.
Also available in AI and AI-S versions. The latest AI-S version focuses slightly closer, so it is probably the best option.
Richard de Stoutz
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