Not sure about 30D...since I am not a canon user, but' K$ ^1 ]7 Q/ c
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For most of the Cameras, this sound is simulated, and it can be turned off in setting manu...' P& X& U% n4 E3 g
3 {" q( r! ^5 l* H/ AThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.