So I just received my second 580EXII and being still at work made me wondering... Now that I have 2 580EXIIs but only 2 PW TT5s, is it possible to use both 580EXIIs off camera by using 1 TT5 on camera, 1 TT5 on 580EXII and act as master, and the other 580EXII as slave? I will eventually get another TT5 or a TT1, but just wanted to know if this is possible... I guess I could try this myself when I get home later, but just wanted to ask you flash experts first. 

