Not sure about 30D...since I am not a canon user, but ) t. Y& l4 A' d+ v& q 8 J0 ^* T/ }4 l+ h$ b F. V5 G& WFor most of the Cameras, this sound is simulated, and it can be turned off in setting manu... * w+ u# I# Z7 W, R / i; s# X- @9 l3 z3 C6 i& T5 q5 J( iThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.