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| p.8 #2 · Official: Canon EOS 5D Mark III Firmware v1.2.1 |
Could you quantify how it was sluggish before. Also, what flash?
There was an issue fixed in the new firmware related to AF performance with flash AF assist enabled. There was a perceptable (2 or 3) second delay before the AF would seem to lock on and focus. This was with 580 classics in my case, but others reported it with 600 and 580v2's.