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I've noticed a similar thing with my 40D and MR14 EX, and also with my 550EX. When shooting a short burst, quite often I notice that the first shot is about 1/3 stop over exposed, with the following shots correct.
I haven't bothered to do any investigative tests, but I notice it quite regularly.
Thanks Rich! The problem is even more pronounced with the MT-24EX. What you're seeing is manageable, because 1/3 of a stop is easy to compensate for in post and the other images are good. I can take a six shot spread and maybe one of them will be dead on with the rest over exposed by varying amounts -but the good one often is a frame in the middle...