Not sure about 30D...since I am not a canon user, but( G$ ^; W k, Z. t; E$ {; S
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For most of the Cameras, this sound is simulated, and it can be turned off in setting manu...3 z D. o+ D8 U K/ }
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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.