These lenses have been vetted and tested on my feature films and spot work.
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In 1981 Nikon introduced their AIS (AUTO INDEXING SHUTTER) lenses even though no Nikon could use AIS features until the FA in 1983. AIS lenses look a lot like AI lenses, but have their smallest F/stop marked in ORANGE. AIS lenses also have: 1) a little indentation in the stainless steel lens mount to indicate that a lens with a linear action diaphragm was mounted.
Same lenses EXCEPT you have to get a Canon EF mount and de-click the lens (aperture) and then you will be able to do Iris pulls, which you cannot do with the ZE lenses. Duclos offers de-clicking service.