Hi: I'm trying to stabilize a superzoom on a tripod and would like to use live view for fine focusing via Eos Utility and mirror lockup to reduce vibrations. While I have no issues when using the shutter button to shoot after mirror lockup (first then second press) in the Eos Utility live view shooting does not function in mirror lock up. What I'm guessing is happening is that in live view the mirror is already up but why does it function differently in Eos Utility vs on the camera untethered? The obvious solution is to fine focus in Eos Utility using the laptop and then turn off auto focus and shoot mirror lockup with 2 second delay. Clearly I'm lacking some basic understanding of how this works.

Genuine thanks, gary