Not sure about 30D...since I am not a canon user, but % W: [" E9 P- \, F: B2 T: j$ ~ . C! X3 p- J4 y/ F9 _For most of the Cameras, this sound is simulated, and it can be turned off in setting manu... b- [& N' s- T5 ]9 H* L; z: L 0 Y! E! C* N1 n6 o2 z C4 uThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.