I have two 580EX IIs. One is experiencing a problem - all of my shots are over exposed, despite what settings I set on camera. When I switch out the flash for the other one, I get perfect exposure every time. Could still be something that I'm overlooking, so I haven't ruled out stupidity upon the user (me). Also, when I press the pilot light, there is a long series of mini flashes that lasts about 1.5 seconds.
Here's a video of my problem. Any help would be appreciated. Thanks.


