Not sure about 30D...since I am not a canon user, but " X- m: G7 y6 d3 V$ r7 @: C ( _6 f. F) W W4 S) tFor most of the Cameras, this sound is simulated, and it can be turned off in setting manu... 1 q2 H+ Z" u) {' J& e C + O# \8 K% T1 N, p7 m1 |" Y0 z* q NThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.