In article <4lc749$7t@sdcc13.ucsd.edu>, cthorste@sdcc13.ucsd.edu says...
[most deleted]
>In Canon's EF lenses, an electromagnetic diaphram (EMD) is employed, >where the body tells a motor in the lens how far to stop down the >diaphram. This is all done electronically, with no moving parts >between camera body and lens. This is how Canon has an "electronic >lensmount". While the F50 (N50), as well as the N4004/5005, uses the >body to control the f/stop, the communication with the diaphram is >still mechanical.

And analogue, with infinitely variable aperture settings possible
(with most bodies), instead of being limited to 1/3rd or 1/2 stop
increments - which is much too gross for exact slide film exposures,
I think. I trust Nikon continues to use an aperture control system
that allows for continuous variability of the exposure.
Hope This Helps