Not sure about 30D...since I am not a canon user, but . [1 A* \: {$ Y* d t0 `, M \7 S7 N- j* s! A S E
For most of the Cameras, this sound is simulated, and it can be turned off in setting manu... 9 M# ]- l, {+ n8 ` y P9 E( c% E4 ^0 @7 [4 kThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.