limited AF area R5 + RF600mm F/11

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Leeuw Forum Member • Posts: 73
limited AF area R5 + RF600mm F/11

Having both RF 600mm F/11 and EF 600mm F/4L II lenses it is surprising and disappointing to see that the max AF area of the RF lens is much smaller than the almost full sensor AF area when the EF lens is used.

The difference is quite big as can be seen in the pictures I took of the R5 flip screen for both situations. Especially for BIF using face detection + tracking this is quite a drawback. But also for spot AF when the subject is outside this ‘small’ AF square.
There is no way to have the AF point beyond this square.

What would be the reason for this?
I guess it has to do with the slow F/11 (the RF800 shows the same issue?) but I can not think of a technical explanation why the AF of the R5 must be limited to this square.

Am I missing something? Has this been reported and discussed before?

R5 with RF600mm :

R5 with EF600mm :

Canon EOS R5
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