Not sure about 30D...since I am not a canon user, but% `( k" R+ X8 u# l [: b8 d5 U
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For most of the Cameras, this sound is simulated, and it can be turned off in setting manu...; \* e9 Y" f8 t
, [0 }' C J+ w" ?The shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.