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http://downloads.canon.com/CDLC/EOS_1DX_AF_Guide_CDLC_Updated_June_2012.pdf See page 37.

In the autofocus guide for the 1Dx and 5D III, Canon divides their lens lineup into groups that allow different numbers of cross type sensors to operate. I thought this was strictly a function of aperture, but if you look at the lists, that does not seem to be the case.

Does anyone know what other factors might be involved?

Thanks,

Mike