Okay, thanks Dom and Tim. I suspected it wouldn't work, and was surprised when the lens fit perfectly into the slot, snapped in place and focused, and didn't seem to interfere with the mirror when I gently turned the blades. But as you said, Tim, the whole mirror issue stopped me from turning on the camera. I was just curious, especially with the odd-looking filing job someone did to the end of the lens. It looks like they narrowed it down by hand with a file to make it fit a camera.
Tim, I've been reading through your old posts and came upon your favorable comments about the Aaton, so I'll look into that camera as well.
Thanks again.
Robert