Not sure about 30D...since I am not a canon user, but # j" y# u% P+ F& {9 \ ) j# o) d3 l* R' D5 uFor most of the Cameras, this sound is simulated, and it can be turned off in setting manu... 8 V, B$ g1 G# P4 K/ A& x$ j1 u S- P2 Y6 N( @+ P8 b
The shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.