Not sure about 30D...since I am not a canon user, but ' @1 f$ x1 W& A |+ U4 T2 w5 WFor most of the Cameras, this sound is simulated, and it can be turned off in setting manu... + D4 o( s, q! f( P" B. n- y! K 3 t- b; B- |0 C9 K0 E1 yThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.