Rickyb wrote:
Flash is Canon 580EXII, camera is set to P, flash set to ETL
flash over ride is O in camera. Same problem when flash is on top of camera and also with extension cord. Never had problem with MARKII or other Mark III. Believe in cam electronics are bad.
I can't help...I don't' shoot flash in any of the auto modes.
I've always shot that way; I had a MK II and a MK III and never had an issue.
Give it a try and see how it goes.