• UPDATE



    The forum will be moving to a new domain in the near future (canonrumorsforum.com). I have turned off "read-only", but I will only leave the two forum nodes you see active for the time being.

    I don't know at this time how quickly the change will happen, but that will move at a good pace I am sure.

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Canon Rumors - Your best source for Canon news, rumors and creators

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