JP 2706781 B2↗1998Assignee: Kyocera CorporationInventors: Eiki Matsuo, Hiroyuki Minagawa, Jun OgawaSole exampleYASHICA ZOOM 25-75mm f/4-5.6 (Yashica Samurai Z)— 12 ELEMENTS / 10 GROUPS, DESIGN f = 25.78–73.05 mm