Not sure about 30D...since I am not a canon user, but 6 H9 m( s% I$ a; Y) m# Y3 v! V7 } 1 {5 d- ~: S, C q3 ^" ?For most of the Cameras, this sound is simulated, and it can be turned off in setting manu... % b0 `! K4 H% y% A$ k0 F; V/ O $ M. H7 V& w6 C$ v& Q; S) ~The shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.