To put it another way - re 5DIII AF

Started Mar 8, 2012 | Discussions thread
stephenmelvin Veteran Member • Posts: 4,547
Re: actually...

altenae wrote:

Answer from Chuck Westfall (You can also reasd this in spec. list of the camera on the Canon site)

The DIGIC 4 in the 1D X is used for that camera’s 100,000 pixel RGB metering sensor. It is not a dedicated AF microprocessor. Both the 1D X and the 5D Mark III use dedicated AF microprocessors; these AF microprocessors are not DIGIC chips.

And the 1DX uses the 100,000 pixel RGB metering sensor for focus tracking.

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