What kind of adapter do you have for the Mamiya?
I have a Mamiya Sekor 50mm f/1.7 and don't know what kind of adapter I must get for it to work on my Pen.. Untill now I thought there isn't one.
Also, can you change apertures? As far as I can see, there's some thing in the back of the lens that must be pushed for the aperture blades to be closed.
Any help will be much appreciated!