Not sure about 30D...since I am not a canon user, but# S( X& S9 u" V/ G
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For most of the Cameras, this sound is simulated, and it can be turned off in setting manu... 3 Q; ]! v+ U4 m/ Q R 8 p7 B8 h& F( e6 c' G6 H: b3 RThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.