Not sure about 30D...since I am not a canon user, but & A: p- c/ } s+ B, ]( m3 B 3 Q" j( u0 ~8 UFor most of the Cameras, this sound is simulated, and it can be turned off in setting manu... + U, z1 |( D9 ]# |1 T5 _7 o( n ; o1 ^9 W0 _3 j; c# PThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.