I've been reading about all of this craziness concerning underexposure on the 400D (XTi). To be honest, this doesn't really bother me too much being that I have vowed only to use the AUTO feature of my camera in dire situations. But after reading some more heated arguments, I have been caught up in the horror of it all. So all in all, I have four questions: 1) How do I determine if the camera underexposes too much? 2) Does the underexposure happen only when the camera is set to Auto? Like, is the underexposure a problem with the camera's light meter, or simply post-processing in camera, or what? 3) Is it possible to set EC in Manual mode?