Not sure about 30D...since I am not a canon user, but) s s% V$ Q' \
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For most of the Cameras, this sound is simulated, and it can be turned off in setting manu... . [$ a6 N1 i. P& O0 X1 D- U/ u0 T9 ^6 y6 b
The shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.