I read in my Magic Lantern book that the menu item for lock up was not for picture taking. I was hoping there was another feature somewhere that I missed that allowed for shooting with the mirror locked.
This got me thinking , if you had to shoot in dark conditions with flash as your main light you could set flash to rear-curtain and exposure to 1/2 second . The flash would fire 1/2 second after the mirror locks up ..... But then with the speed of flash you wouldn't be needing mirror-lock up:tongue: