Not sure about 30D...since I am not a canon user, but 1 v8 D0 m0 Z; Y ) N4 H- |( S/ n4 @3 NFor most of the Cameras, this sound is simulated, and it can be turned off in setting manu... " W* z/ j8 _" \ - u# | g: L1 g5 U$ KThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.