OK first off I know the Yongnuo yn468 is an optical slave unit while the 580ex is via light pulses.
So here I am with a 7D that has flash master control. I am wondering if I set the 7d flash to Master Wireless that will also fire off flash it should technically work right?
7D master: ETTL II
YN468: S2 (slave. Avoid pre-flash pulses and fire upon master's flash)
580ex: Slave. Group A.
In theory, it should work right? But in practice I only managed to get the 580ex to go off. YN468 didn't despite the 7d's flash fired as well.
Even if I switched from ETTL II to Manual, the yn468 didn't respond. It did only when I disable Wireless Flash altogether.