You mentioned that when someone else tried using the AE-L/AF-L button it wouldn't work for them, but now it works perfectly for you. Maybe I'm making the same mistake that the other person was making. Could you go over your process, and see if there is something I might be goofing up with?

It seems pretty simple, yet my ham-hands can't seem to get it to work right. Could be caused a setting, or could by how I'm using it. Just pressing the AE-L/AE-F button should focus the camera, then let it go, re-compose, and fire away, right? Mine won't fire if the selected focus are doesn't detect focus, and it doesn't matter if I'm in AF-C or AF-S.

Brad