In article <31B50C08.470D@erols.com>, rwphoto@erols.com says...

>Could someone direct me towards a chart of usable aperature vs. amount
>of shift? When not using a 100% view finder, I occassionally get
>cut-off at medium aperatures and high shift, especially verticals, of
>course. I am prepared to argue either Canon or Nikon in return, your
>choice. Lens in question is Nikkor 35mm/3.5 PC.

Though the Nikkor PC's are rated to cover with a max of 8mm shift with
a vertical framing, they will all illuminate a full 11mm shift, with
the smallest apertures required to optimize far edge sharpness. If
you are getting vignette (on film, not in the VF, where the shifted
optical system darkens one side of the screen [which is why none but
F3 meters will meter shifted PC's correctly]), I suspect that you are
using a lens shade and/or a thick-rimmed filter. Remove both, and the
Nikkor PC's will not vignette with any amount/direction of shift. BTW,
the Nikkor PC's with the best off-axis performance (stopped down), are
the older 28mm f4 and the latest version of the 35mm f2.8 (f22 is
required for full-vertical-shift edge optimization, f8 [35mm] or f11
[28mm] for full-horizontal-shift edge/corner optimization.
Hope This Helps