Recently, I've noticed that the setting I have been using for a year and a half (C-AF-TR, with C-AF Lock set to high) doesn't seem to work as well as it once did. Too often the C-AF lock does not stay on the subject and just ends up locking on something else in the scene. The way I'm using the E-M1's video recording, is basically just following a subject who walks around (shopping mall, street, at home, etc.), shooting run&gun style. So ideally, I want to be able to lock onto the subject I'm following and have it stay on the subject from any angle, in any lighting condition, without me having to constantly having to re-lock onto the subject when the C-AF lock loses the subject. I know that's a tall order and I can't get that kind of performance from any camera/camcorder, but I just want to know what setting will get me the closest to that ideal (including what AF area/size setting).