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| p.1 #3 · Upgrade 580EX to 600EX-RT? |
... af performance is improved with the 1dx/5d3 when using the new speed lights that make use of the new af point array.
Low light AF works better with a 600EX-RT on my 1DX than a 580EX or 580EX II. Also, the 600EX-RT goes to 200mm focal length, which may be useful or not, depending on what you do.