Marcos H. Woehrmann wrote in message ...

>Is there any advantage to using a Nikon AIS lens vs. a AI lens
>on an N90s (F90x)?

No.

>It was my impresion that the AIS had a linear
>relationship between the iris stop down lever and the f-stop, which
>allows shutter priority mode, but this doesn't seem to be the case.


It does, but the N90 doesn't make use of it.

>Another question, the mounts on all of the NIkon lenses I've seen
>have a depression on the back that has sloping sides, very roughly
>like this:
>
>\ /
> \_____/


This is characteristic of AIS lenses.

>I noticed on a friends older Nikon that the lens mount had a pin
>which fit this depression, but modern Nikons don't have it. What
>is it for?

For telling the body that the lens is AIS...
--
David Ruether
http://www.fcinet.com/ruether
ruether@fcinet.com