Not sure about 30D...since I am not a canon user, but 4 z! m+ l1 \0 Q+ z2 l: @0 Y& L! }. K' S3 l! u
For most of the Cameras, this sound is simulated, and it can be turned off in setting manu...$ e& `0 M3 g- o6 E Y
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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.