So is it only in AI-Servo mode it goes black? Does the Single Shot still glow red?
Yes, if you set it to always illuminate.
What option on my 5Dmk3 am I missing to make this happen? I always shoot Single Shot and never see the focus points red (except for when they gained focus).
There is not much to complain about with the 5Dmk3, but missing the red focus point(s) is by far my number one complaint about the camera.
"Always illuminate" doesn't mean that they stay illuminated, it means that they are always illuminated when focus is achieved
, and indeed, only in One Shot mode. That's the behaviour you're already familiar with. Also, while manually selecting, the focus points become red. Other than that, it's all black. This is what is bugging people: they want a red flash in AI Servo as well.
Relevant page in the manual is 103 (Customizing AF Functions/VF display illumination); in the menu it's AF5>VF display illumination.
*chimes in* If AI Servo gets to have black focus points I'd be happy, always a red confirmation would be even better.AI servo shoots whether in focus or not. Thats why it doesn't light. USE AI Servo when you will be happy with near focus shots, or maybe totally out of focus shots if you force it to fire. On the 5D MK III and 1 DX, you can select in focus priority for only the first shot, or for all shots, it depends on the subject.
First of all, I found the option "AF point display during focus" (manual: page 102, menu: AF5>AF point display during focus) which gives me the used focus points during AI Servo. I probably disabled that while toying around, which I've done a lot over the past month and a half
The "always show me black focus points in AI Servo" question was ill researched on my part and is now solved as far as I'm concerned
As for the remainder of your post: I know you can control focus or speed priority
The 5D3 (I don't have the 1DX) can actually require focus, always shoot, or try to be clever about it. I have required focus set for 2nd shot and onwards, it's just the first picture that I'm allowing for the machine trying to balance speed and focus.
I'd be happy if it only lit up when perfect focus is achieved, but it doesn't even do that. It just NEVER lites up in AI Servo. And again: that's the issue at stake here.
BTW: does anyone EVER use AI Focus? edit: well thank you Photophreek, way to beat me to it