From what I have seen, there is a spring in the aperture mechanism that will open the aperture all the way or close it all the way down (don't remember which way). You can try it by setting an aperture setting and removing the lens.
platscha wrote:
I was told that if you set aperture with lens on properly and then reverse, it retains that setting, have not tried it though. I do have an older 50 mm as well.
Works great. Attach lens, select the aperture you want, hold the DOF button, and turn off the camera. The lens will hold the aperture and you can then reverse it.
