Mesca in a vintage light. (Patreon)

Sometimes I use lenses that are too vintage also for my standards, and I'm not sure I really like the result...
When I plan to use them, I do just few pictures during the shooting, so as not to waste too much time with a valuable model.
This was part of the experiments with the Pentacon 50mm 1.8 M42 mount and Mesca.
The results are interesting, but should I even bother using this kind of lens?