Quote Originally Posted by conropl View Post
On my 580 II you have to make sure the C.Fn-07 is set properly. At the "0" (which I think is the defult) the output power for a test fire is 1/32 power. If you change C.Fn-07 to the "1" state, then the flash will fire at full power when test fired. I assume full power would mean it would fire at the power you have it set to, but I do not have time right now to look that up to confirm (I will try latter).
Very interesting...I did not know that.