Not sure about 30D...since I am not a canon user, but ) r" g" ^- m; N( E& f , _: N: z8 s3 ~. N5 lFor most of the Cameras, this sound is simulated, and it can be turned off in setting manu... ) B% |7 ]- @2 T6 I7 M ; K3 o- x0 e( y$ S* M% y3 {The shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.