Not sure about 30D...since I am not a canon user, but% ^9 m' y' b4 o. {* T7 K' F
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For most of the Cameras, this sound is simulated, and it can be turned off in setting manu... $ n& [6 t/ y$ B/ J x# T5 p . i2 O6 T7 l8 e- |6 X8 OThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.