JP 2000-321490 A↗2000Assignee: Cosina Co., Ltd.Inventors: Koji ShiokawaVOIGTLÄNDER ULTRON 35mm f/1.7 Aspherical L39— 8 ELEMENTS / 6 GROUPS, DESIGN f = 36.05 mm
JP 2000-330014 A↗2000Assignee: Cosina Co., Ltd.Inventors: Koji ShiokawaVOIGTLÄNDER NOKTON 50mm f/1.5 Aspherical L39— 6 ELEMENTS / 5 GROUPS, DESIGN f = 51.60 mm