Not sure about 30D...since I am not a canon user, but, y# }2 q3 k5 Y- f
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For most of the Cameras, this sound is simulated, and it can be turned off in setting manu... 5 I* w9 \- x8 P) f$ F2 D: L" G3 v$ X" s1 k
The shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.