Not sure about 30D...since I am not a canon user, but # W! @' f' Q8 H4 Y' J8 J& y3 L 1 u+ m- k9 {$ Y, q( I+ JFor most of the Cameras, this sound is simulated, and it can be turned off in setting manu... * m9 a4 [. m& ~2 T2 k3 y : o: @3 T. {; D7 @The shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.