The Zeiss ZF-I industrial lenses announced by Zeiss Germany are not the same as the prototype lenses for infrared that I recently evaluated, which use single-coating to enhance infrared performance. The newly-announced ZF-I lenses have additional sealing for water and dust, as well as locking screws for focus and aperture. I’m not a big fan of silver-colored lens bodies, but this does solve the problem of distinguishing the lenses from the regular ZF line. The ZF-I lenses won’t be available through normal retail channels however, so don’t expect to see them on camera bodies anytime soon.
Zeiss ZF-I lens