Not sure about 30D...since I am not a canon user, but+ g! B+ J& k4 Y) T5 {: F
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For most of the Cameras, this sound is simulated, and it can be turned off in setting manu... 4 G& Q; K6 }1 H$ H$ g- z G h; Q: N/ K5 V2 k0 C# \The shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.