I've just bought a canon camera shoe cord 2 and immediately attached with a soldering iron to extend the lead to 5 meters. A quick test shows it works OK but I've not had a chance to put into action yet.
On the 580 I think your find the master/slave bit relates to 550/580/STE-2 units driving other 550/580/420/430 units in slave mode. It also gets a bit more complex in that you can have different slave groups with variable power ratio in more complex setups.
Last edited by robski; 21-01-07 at 22:57.
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