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Title: Love it, but some problems with 580EX II.
Review: I did many tests with 580EX II and 430EX II. The 430 fired every time from up to 120 feet (didn't try any further than that). The 580 was less predictable. It fired 100% from within 20 feet, but beyond that I had to mess with the position of the transmitter to get it to fire. Putting the recevier 8 feet away from the 580 with a PC extension cable didn't help much.
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