Not sure about 30D...since I am not a canon user, but* j& a* {, m, V+ y2 ?0 b+ w( M
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For most of the Cameras, this sound is simulated, and it can be turned off in setting manu...( m1 r0 j0 L/ g- a/ D: l
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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.