In article <5179pe$kfk@uni.library.ucla.edu>, eric@ucla.edu says...

>I recently bought a large lot of used Nikon equipment. In the lot of
>equipment there are several manual focus lenses. I was wondering how
>to tell if these leneses are pre AI, AI, or AIS lenses? They all seem
>to have the small bracket that used to link to the F2 finders.

The ones with the uniformly smooth rear edge on the aperture ring are
non-AI; the ones with the orange minimum aperature and a small "scoop"
in the chrome bayonette flat surface are AIS; the others are AI (and
the focus rings move forward when the lens is focused close, unlike
with AIS lenses).
Hope This Helps