It does keep lens open till shutter released on RZ/RB, it does on AF lenses for 645 series.OK, I have a question. I used to shoot Bronica and I don't remember stopping down when I changed the aperture (same on Hassy that I tried this weekend). Doesn't the Mamiya work the same?
Let's say that you need f8 @1/250 .... when you set the aperture on the lens, does it closes the diaphragm down or it get's closed when the shutter is tripped?
MF lenses on AF bodies? no, not so much. Its mechanical connection that AFD bodies simpley wont have. Same as they wont have connection for L/S MF lenses to do shutter cocking/release, so you will have to do extra move for that.