Not sure about 30D...since I am not a canon user, but * d' x4 k( i; I! `# Y) z7 l- I6 t 4 `) `/ J8 j( y7 l. qFor most of the Cameras, this sound is simulated, and it can be turned off in setting manu... 4 c9 {6 r1 P; z* M" q$ [6 P9 o * q! B. g( b- ]5 Q$ C* LThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.