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I received my 1DX Wednesday and it's pretty much all set except for the AF. Firware version: 1.1.1 Lens combo: 500mm (v1) + TC2.0III and 400mm F/5.6 + TC1.4III When I use one of these combos there is no way to change the AF Drive mode to "AI-Servo". It is always manual focus (MF). I read that in order to auto-focus at f/8, we need to use the center AF point + the 4 expansion points (2 vertical and 2 horizontal) and we need to use AI-Servo but it doesn't let me change it, it stays on MF. What am I doing wrong?
The lenses are set to AF. I have no problem with the 500mm + TC1.4 or any other combinations of lenses and TCII or TCIII but as soon as I use a combo that gives me f/8, the only AF mode I have is MF. Is there a setting somewhere that should be ON?
Do you mean the only AF mode you have is One Shot? (MF, to me, means manual focus)
Try Chas' suggestion
When I use any lenses or combo that gives me a max aperture of F/5.6, the AF modes are: One shot and AI Servo. But as soon as I use a combo that gives me a max aperture of f/8, the only AF mode available is Manual Focus. I've tried TC vII and TC vIII.
But I'll give a try to the new firmware v1.2.1 and I'll let you know if it fixes the problem.
There was a range of serial numbers that needed a firmware reinstall for af at f8 to work, even though they were supplied factory installed with firmware version 1.1.1 and should have worked straight out of the box. Versions within versions I guess.