need some help, i have a 580ex flash mounted on top of camera. camera in manual mode, i set 580ex to M mode and adjust power setting from 1/1 to 1/128, the exposure stays the same, it seems that the flash is always firing a full power
when i switch the 580ex to ETTL, the flash works flawlessly.
when i take off the flash from the camera and press the pilot button, the flash also fires FULL power, i checked custom function and its set to fire at 1/32 when the test button is pressed.
any idea what the problem? the unit is already out of warranty...