Canon EF 800mm f5.6 + 1.4x III extender with 1DX Mark II

Takes it to f/8, so I would have thought AF would still be possible on a 1DXii. This article says 61 points may be available…

Auto Focus - EOS-1D X Mark II - Canon UK

Lock, track and shootPhotography so sharp it’s dangerous. ...
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From Digital Picture Review…

”Extenders are another option for increasing MM - and these do not require getting closer to your subject. The Canon 1.4x Extender will yield an 1120mm f/8 IS Lens, but currently only Canon 1-Series bodies can autofocus this combination (with the center point only). The 1.4x adds CA and barrel distortion. Adding the Canon 2x Extender to the 800 will result in a dark 1600mm f/11 IS lens that will not AF on any Canon body. I use extenders occasionally, but much prefer to use a bare lens if possible.”
 
GeeJay57 said:
From Digital Picture Review…

”Extenders are another option for increasing MM - and these do not require getting closer to your subject. The Canon 1.4x Extender will yield an 1120mm f/8 IS Lens, but currently only Canon 1-Series bodies can autofocus this combination (with the center point only). The 1.4x adds CA and barrel distortion. Adding the Canon 2x Extender to the 800 will result in a dark 1600mm f/11 IS lens that will not AF on any Canon body. I use extenders occasionally, but much prefer to use a bare lens if possible.”
Click to expand...
Thanks - is that from somewhere online you can link to?
 
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