So I did a bit of an experiment recently using Leica M2 and MP with Tri X and Portra 400. I wanted to see if I could have a film that I could keep in 1 camera and have the ability to use it for all shots and have colour for some subjects and B&W for others on the same roll. I shot the 2
cameras side by side with Tri X and Portra 400 using the metered settings form the MP (Portra) and the M2 (Tri X) for a variety of subjects with the same FL lenses for each shots and converted a couple to B&W in Lightroom to compare results.
Tri X
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Portra 400 converted in LR
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Of course back in the pre-digital days such things were almost impossible and certainly a converted from colour would be no way as goo as a straight B&W but in today's technology I can load Portra and shoot with 1 camera to get better (IMO) B&W images and still have colour options plus save the cost of the extra film.
Next is to try it in my Bronica SQ-Ai just swapping backs, I have a suspicion that some of the difference is down to the newer lenses used on the MP versus the older lenses on the M2.