In article <01bc0452$33494340$31c920cc@steven>, sweixel@ix.netcom.com says...

>Canon is the only one with tilt & shift, and I would think that the tilt
>would be more important than the shift if you wanted to correct the
>"falling bacl" effect.

Ummm, no it isn't.... The relevant condition, as an earlier poster
indicated, is that the film and subject planes be parallel (or, in
architecture, another way of stating it is that the true horizon line
is placed dead center in the unshifted camera image frame - after
which the lens can be shifted to move the horizon line without causing
vertical-line convergence). Tilt allows the film, lens, and a subject
plane to intersect each other in a single line, giving a plane of focus
that is not parallel with the film (as in shooting a flat field of tulips
sharply, which can be done with a relatively wide aperture, even with a
longer FL lens, if the tilt can be set up properly).
Hope This Helps