Quote Originally Posted by David Lyga View Post
MATT: Yes, you are putting it 'inside', but watch your semantics! The 'inside' is only a couple of millimeters! You do NOT have to worry about the mirror crashing into the lens because you are not flipping the shutter. It is really not rocket science. - David Lyga
No it's not rocket science.
You don't want to accept that FF distance doesn't matter. For work with a bellows, yes the lens will form an image but not at infinity.
With the mirror down it will not allow the lens to be close enough to the film. Remember, the focusing screen in the camera is equivalent to the distance to the film plane.
Raise the mirror and put a ground glass at the film plane and it will work, otherwise no go.