ZF-I: Specifically for Industrial Applications - ZEISS industrial lenses can also be used for machine vision, quality assurance and Close Range Photogrammetry.
Zeiss ZF-I lenses are optically identical to the ZF series lenses and feature locking focus and aperture rings. The lenses have a black finish, with the exception of the 2.8/25 ZF-I and 2/28 ZF-I which have a silver finish barrel.