In article <4dtt6l$ei1@polkuauto.cs.hut.fi>, ilu@niksula.hut.fi says...

>I remember reading that you should focus the PC Nikkor
>at zero shift and something about the exposure metering
>was weird also. I haven't filed the info ... can somebody
>explain this again?

The Nikkor PC lenses (or any PC's) should be focused on a plain
(or plain plus grid lines) VF screen shifted to the taking
position - do not use focus "aids" (if you feel you must use
those dreadful "aids" :), center the lens first, but focus may
be slightly less accurate if the lens has field curvature).
Metering should be done with the lens centered on all bodies
except the F3, which will accurately meter through the shifted
lens at all but the most extreme rise in the vertical frame
position (this is beyond Nikon's recommended rise limits [That's
what those little numbers running from 7 to 11 on the outside
edge of the lens indicate: the max recommended shift at different
orientations of the lens - though they may be ignored at the
smallest stop or two.]).
Hope This Helps