Not sure about 30D...since I am not a canon user, but + K: S! s; Y9 p( U& @: h, J ' l& i" F: E5 N$ b( F" LFor most of the Cameras, this sound is simulated, and it can be turned off in setting manu... ' Z5 T7 f& `* @" E; q p% L+ Z i/ d / S# S6 m8 m4 d# b" uThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.