I used my two brand new 580ex ii flashes this weekend at a wedding and had two problems. When I had them set up as one as master and the other as slave the master flash was firing but extremely weakly. In the photo you could only see the evidence of the slave flash not master flash was visible. No exposure compensation was set. When I set that flash to normal and shut the slave off it worked perfect, great exposure. Why when it was in master mode would it not fire correctly??
My second problem was one of my flashes kept reverting to ttl instead of staying on ettl. Why?? Thank you!
Hi Kate,
What camera that you are having problem with those flashes?
Will switching the two have the same problems.
Make sure it is fully pushed forward into hotshoe & locked:-)
Try shooting second current, this will save you the repair costs.
Your exposure compensation was set to zero, but was your flash compensation set at zero?
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SOURCE: 580ex switching from ettl to ttl
I´ve been having the same problem with my 2 580´s. Sent one to Canon but still has the same problem. How did you solve your problem?
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