In article <1996Nov21.040538.5058@lafn.org>, bb389@lafn.org says...
[description of metering differences from a white
surface with different lenses/cameras deleted]
>I'm going to check performance at f/22 when I get off, just to see what
>happens and check a Schneider 180mm Symmar that I use a lot on my 5x7,
>but does anyone have any suggestions as to the possible causes of this
>great discrepancy?

I trust you focused each lens to the same distance.....
There should be little metered difference between lenses focused
to the same distance under the same conditions, but meters rarely
agree exactly, and other factors may account for it. If metering
is whole-frame in one camera, and narrow angle in another, lens
illumination roll-off in 35mm lenses used wide-open for metering can
affect the metering. Also (related), the view camera lens may be
close to true speed wide-open, while 35mm format lenses rarely are
(try an exposure sequence, starting at max. aperture, and you will
generally see less exposure in the wide-open-diaphragm frame...).
As you get to smaller stops, diaphragm errors creep in. If you use
a leaf-shutter (commonly off +/- 1/3rd stop), shutter efficiency
will also change the exposure a surprising amount between wide and
small stops. Non-quartz-controlled focal-plane shutters can produce
noticeable exposure errors at some speeds.
You are doing what you need to do for accurate exposure:
a bit of testing. But there are many variables complicating it...
(A recent discussion by e-mail with someone pointed out the folley
of fancy metering systems being applied on top of camera exposure
systems that are inherently imprecise [adding wubblies on top of
wubblies, as it were...;-]) Experience is a good guide: take pictures,
take notes, and apply the fudge-factors that become apparent through
experience....
Hope This Helps