the loud clunk of the shutter and mirror slap of a Mamiya 645 is something to behold - that is NOT a stealthy camera. Also, my Fuji 6x8 rangefinder has an astonishingly loud shutter for such a (relatively) modern camera. I like it more than the Fuji electronic 645 cameras - where the 'bleep' and motor noise is louder than the shutter...

Marc!