Not sure about 30D...since I am not a canon user, but/ q" m. Q& x/ w& z, J% T/ b
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For most of the Cameras, this sound is simulated, and it can be turned off in setting manu... " u5 f% s* S {" D) f0 L6 l* e3 Z+ {& G
The shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.