Quote Originally Posted by ChadS View Post
I'm shooting in live view as that's the way I have to focus. However, I can clearly hear the mirror slap. I'll pull the lens and verify that the mirror is, in fact, moving up and down. Obviously the shutter must still fire but that's not a lot of vibration - though it would be a simple matter to make an external shutter. However, I don't think I can hack my T2i to still expose when the shutter is disabled and open.
You could not be getting a live image on your LCD if the mirror was down, the mirror would block the sensor if it was not up. You must be hearing the shutter.