In article <5btqnh$lu2@news.ccit.arizona.edu>, dimitris@f1n3.U.Arizona.EDU says...

> I would like to ask a question about the Nikon mounts. I just bought a
>Nikon EM with a 50mm/f1.8 E lens, and I would like to know about what kind
>of lenses (mounts) it is capable of handling. If someone knows information
>about this (or knows source of information) please respond to me.

The short answer is: any current Nikkor lens.
(If you run your finger around the rear edge of the aperture ring,
and it is smooth (no ridges), DO NOT mount that non-AI type lens
[though even these will fit, if "AI'd" for about $30]).

> I would like also to know differences between the AI, AIS, ...

The short answer is: none, for your purposes...
(A few bodies need the "S" characteristics for some functions.)
Hope This Helps