Most interesting little video showing the shutter actuation of Canon 5D. No reflection on the 5D, rather see it as something all DSLR are prone too, although some more than others.
http://www.canonrumors.com/2009/07/5d-shutter-in-slow-motion/
http://www.canonrumors.com/2009/07/5d-shutter-in-slow-motion/