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Zeiss ZE lenses don't have an aperture ring, so using them on NEX will be a challenge. From what I understand, you can mount the lens on a Canon camera, set the aperture, and then remount on NEX and it will hold the aperture. Or, there is a adapter out there that has aperture blades built in,.but it doesn't seem that great from what I've seen.
Ultimately, you're better off with ZF, ZS, ZK or Contax C/Y.