Actually, the Summicron-M 50mm lens will do a lovely job of digitizing negatives, presuming you have the right extension tubes, etc, to enable focusing at near 1:1 macro distances. As example, I grabbed a couple of random negs off a roll of ACROS 100 shot with my Minox 35GT-E around holiday time in 2023 and scanned them with the M10-M/Summicron-M 50mm lens using the BEOON copy device.

Sample Scan #1

Sample Scan #2
I rendered them quickly, about five minutes work in LR, so I wouldn't call them the best practices work, but I don't see any problems using the raw files I made with the M10-M and Summicron 50mm.
🙂
G