If I'm reading this right, I will now be able to extend my EF100-400 f/5.6 with a 1.4 extender, giving me effective 560mm at f/8... AND will now autofocus on my 1DX???
Is this right?
That's correct - and I'll be using it that way. Plus, my 600/4 II will now AF with the 2x extender, and from the TDP ISO 12233 charts, the 600 II + 2xIII gives IQ a little better than the 800/5.6 + 1.4xIII, plus it's a little longer (1200mm vs. 1120mm).
All around, I'm a happy camper.
Now nikon no longer has the F/8 AF advantage anymore.
They still have many more AF points available with an f/8 lens. Just sayin'.
Note that the press release was available this morning, but it has now been pulled from the Canon USA Press Releases page
, and the firmware link is still not active.
Seems like this was not ready for release from embargo yet (maybe planned for announcement closer to PhotoPlus?), and someone goofed and let it slip out early (or it was an intentional leak).
Still, this means we should see it sometime soon. Later today, or if not, in a few days.