Digital Esoterica: The firmware hack on the Rebel is a blessing. The half-press of the shutter when it is in one-shot mode (the left arrow key must be set to OS) works fine. And the mirror lock-up works - but - and this is what I discovered during the recent night shooting - if you use the Exposure Compensation button the mirror lock-up does not work. Not a big deal - but it had me confused because when I was looking through some of the images I noticed some had a fair amount of shake to them, and others were fine; and I thought while I was shooting that the mirror lock-up had stopped working but chalked it up to my imagination.
Mirror lock-up for any of this night type stuff is an absolute necessity.
And now, here's the fun part. When I used to shoot with the view camera at night, I would have a little pad and a flashlight, and I'd write down the camera info and go back and develop the stuff by hand and see what worked and what didn't work and go out the next night and make changes as needed. Now the info is stuck in the file so you can see exactly what you were doing. So here's the data for this shot:
Shutter Speed: 2.5 seconds
White Balance: Auto
FDR Zoom (Night)