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Leica Summicron-R 50 mm f/2 II 'Safari' edition from 1978.

Leica APO Summicron-M 50 mm f/2.

Leica Summicron-M 50 mm f/2 from 1960.

The name Summicron is used by Leica to designate camera lenses that have a maximum aperture of f/2 after 1953 and to present day.