Quote Originally Posted by OldClicker
Try the Live View and see if it is quieter. In some (many?, most?, all?) cameras, the mirror goes down first in Live Viewand then back up before the shutter opens making it even noisier. - Terry
I tested my 40D in live view mode tonight. It is much quieter while shooting in live view with no mirror slap. Other than the mirror slap from turning on the live view of course.