In article <5epsut$s2i@login.freenet.columbus.oh.us>, achakali@freenet.columbus.oh.us says...

>Looking for someone who HAS ACTUALLY USED the 28 and 35 mm perspective
>control lenses. The 35 is about 1/2 the cost but what are it's
>limitations other than the field of view differences?
>My interest is in photographing ruins. I've shot some without a PC lens
>(20, 28 & 55 mm) with obvious distortion hence the interest.

I would NOT overlook the angle-of-view issue! If space is cramped,
the 35 will just not be wide enough... If you generally have plenty
of room (though your comment about the 20mm indicates that holding
it level, it was not sufficient to cover what you wanted...), the
(*latest* version Nikkor 35mm f2.8 PC) performs better than the 28mm's
(in Nikkor 28mm PC's, I prefer the older f4 version to the current
f3.5). Both allow full 11mm rise in H. orientation, and are sharp to
the upper corners by f11 (the 35 by f8), and full 11mm rise in V.
orientation, with some softness in the upper corners even at f22
(do NOT use a shade, or a thick-rimmed filter, or vignette will
occur with full rise with either lens). The 35mm f2.8 PC is a
very fine lens, even wide-open (2-3mm shift OK). I recommend looking
for the older 28mm f4 PC Nikkor for best shifted sharpness - though
the f3.5 version is quite useable. BTW, don't overlook the
possibilities of a super-wide used level and V. orientation - with
something interesting used to fill the bottom part of the photo
(my 15mm has enabled the taking of many an architectural photo that
the 28mm PC was not wide enough to cover).
Hope This Helps