I do want to work off available light but i want to try some off camera lighting also with a shoot through umbrella, but im not sure if the canon wireless system will work outside 100%
ie: triggering my 430ex as a slave with the master 580ex on the cameras hotshoe.
perhaps someone could shed some light on this
The IR master/slave triggering will only work if there is clear line of sight between the IR sensors on the sppedlights... so an umbrella will most likely be a no go I'm afraid.
What a great opportunity you have here! Best of luck for it!

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