Mark,
If you were using color negative your assessment *may* be confounded with
color balancing from the printer. If you used one lens exclusively for
each film roll, my suspicion about this increases. I've found some labs
wander all over with color balancing, others very consistently correct each
frame to a tight standard. Yet others set the balancing filters on the
enlarger using the first frame on the film strip to be printed (may be last
frame shot depending on which end is inserted into the printer) and use it
for the rest of the film roll.
Assess these possibilities when evaluating color response. I use slide
films for testing lenses and camera bodies. It's more demanding of
exposure accuracy and removes any confounding a print processor may
introduce in print exposure, color balancing and enlarger focusing
accuracy. You may wish to try another A/B/C comparison outdoors using the
same daylight conditions.
FWIW I have three 50/1.4 MC lenses and haven't noted any color rendition
differences between them that cannot be esily attributed to lighting
differences. Nor have I noted any differences when compared to my 50/1.2
or any of the other lenses.
-- John
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