I recently bought a Mamiya 645 Pro TL with a lens, grip, viewfinder, and film back. It’s a medium format camera. To test out that all parts were working as advertised, I put a roll of film in it and went to work. I tested the auto-exposure and manual exposure. The film advance in the grip, too. Everything worked. Focus was on the little lamp, leaving the flowers outside the field of focus. In post, I used Negative Lab Pro to process the images, but turned them to black and white in LR. Altogether, I am happy with my purchase. And I managed to get a few pictures that were decent out of all that play!