I think I got my cable form HK at US$ 40...
From what I think (And not completely worked on) the 550 and 580 synchronizations and TTL communications is via wireless features and not IR so on board flash does not trigger it. The good thing here, is even line of sight is blocked, still there is no problem. But most likely a wireless module should be able to do this. It gets nice when one flash is on cable and the others where you need them. Well as you said, this comes at a price tag. A big one indeed that if in professional use, surely will pay back.
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S a s s a n .
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"No one is going to take our democracy away from us. Not now, not ever.
" JOE BIDEN
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