Twenty questions about new Zeiss ZF/ZS SLR lenses 2 February, 200627 February, 2006 Nicolai Grossman Kit/Equipment Rob Galbraith asked 20 questions of Kornelius J. Mueller, Marketing Manager of Zeiss’ camera lens division, about the new ZF (Nikon F mount) and ZS (M42 screw mount) SLR lenses. Read the interview here.