Not sure about 30D...since I am not a canon user, but " i8 B) t* `# c4 T% Y 4 }& f! d0 p0 y4 PFor most of the Cameras, this sound is simulated, and it can be turned off in setting manu... 3 O3 g2 W+ [; K! m1 a# w 2 d: A5 K/ C+ Q+ ?+ J) B1 IThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.