Not sure about 30D...since I am not a canon user, but ; B0 @+ S/ T( G2 t9 O. x8 l 0 D; T+ |# O3 J% NFor most of the Cameras, this sound is simulated, and it can be turned off in setting manu... 0 }" f: j" [3 j. O" [' `5 Z' y+ f% n: ~9 z
The shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.