Quote Originally Posted by olwick View Post
The Pentax 67's problems are also due to the shutter curtain. See the illustration, even with the mirror locked up, here:
That's an interesting photo with a double image in the detail.
But, if the shutter bounced that far it would have gone more than 1/2 way back across the negative.
In any case camera movement doesn't give a double image, it gives a blurred image.