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I've got 2 600EX-RT for their radio capability. Anyone knows how can I make my 430EX-ii "radio enable" so that way I could use 600EX-RT with 430EX-ii. Anyone know any trick to make 430EX work with radio ?
Like Danny wrote, if you want to add the 430EX II to the mix, you have to go optical as radio wireless won't work anymore...
Another budget solution is to ditch your 600ex-rt's and get Yongnuo flashes and radio triggers.