Not sure about 30D...since I am not a canon user, but/ O5 R- X. ^7 G! }
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For most of the Cameras, this sound is simulated, and it can be turned off in setting manu... ( H: I }( h6 e1 k' } : g1 X% @$ v" X+ m# d4 E. \The shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.