The newer, more expensive ZF.2 version is not available in my country as of right now. The differences between ZF and ZF.2 lenses are listed on the Carl Zeiss website: Welcome to Carl Zeiss Camera Lenses But I'm not sure I understand. What exactly do you give up by going with the older ZF version if you only intend to use your camera in Manual mode? My cameras: D700 & D2Xs. Also, what focusing screen would you recommend?