Not sure about 30D...since I am not a canon user, but# d0 l, K' T8 w7 ?' L$ ^* [& P
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For most of the Cameras, this sound is simulated, and it can be turned off in setting manu...: ?8 Z; P4 m6 s; d$ \. ]0 k! Z
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The shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.