What does "sun facing the camera" mean? You know you never and I mean never point your camera towards the Sun. Now do you just mean the Sun is in the shot? Well, you know you are up against the DR, dynamic range, of the camera. It is likely you have exceeded the DR and the shot is not possible using normal procedure. A little more info would be helpful perhaps a sample of what you want.
EB
EOS 1DX and 1D Mk IV and less lenses then before!
