Nikon 105mm f/2.5 NIKKOR F, AI and AI-s
Five elements in four groups. Identical optics since 1971 Multicoated since the “C” version of 1973. (The oldest 1959-1971 version not reviewed here uses a different 5 element in 3 group design, which was also so good that it helped establish Nikon’s reputation to this very day).
Seven-bladed diaphragm stopping down to f/22.
Closest focus 1m.
Takes 52mm filters.
Built-in telescoping hood.
It’s 2.5″ (64mm) around by 3.1″ (78mm) long and weighs 15 oz. (435g).
The 1969 non-AI version weighs 375.8g or 13.260 oz. and is 2.550″ (64.73 mm) long x 2.599″ (66.02mm) diameter.
Made in Japan.