In reading the M-9 instructions, I see that there are several options available. I just want to make sure I understand the function of “Discreet”. The way I read the passage is that the shutter is not cocked till you release the button and can be set for a time delay. It appears that this might be something similar to a mirror up in as much as vibrations can be at a bare minimum (so long as you’re on a tripod). Do I have this right?