DE 3602859 A1↗1986Assignee: Jenoptik Jena GmbHInventors: Utz Schneider, Volker Tautz, Karin HolotaSole exampleCARL ZEISS JENA VARIO-PRAKTICAR 35-70mm f/2.7-3.5 MC— 9 ELEMENTS / 8 GROUPS, f ≈ 35.0-65.2 mm (DESIGN)