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my 35L worked perfectely on the 30D and 50D, but not on the 1D3.
problem: focus accuracy at wider apertures and close distance.
as i said: this problem did not exist on those apsc-cameras.
studied the case, found some technical explanations and concluded that it's not a perfect combo.
dont ask me for details please.
i suppose that the new 24L is focussing perfectely on my 1D's.
Forgive me, but I find it hard to believe that the (at the time) top dog in af speed is bested by xxd cameras, unless you had an issue with the 1d3.