Quote Originally Posted by David A. Goldfarb View Post
The laser pointer and penny tests don't really tell you if the vibration is affecting the image. There could be a lot of vibration when the mirror returns and the shutter closes, and that wouldn't make any difference.
I actually did a laser pointer test on my 6x7 with & without MLU and using slow speeds and B in order to differentiate between mirror rising, shutter opening and shutter+mirror closing (unable to differentiate between those two).

True, the worst vibrations were with the mirror/shutter closing. The shutter opening was fairly weak (but visble) and the mirror raising stronger still, but a long way from being a major part of the jolt you feel when you shoot the beast.