1DX or 1D4

[RLPhoto]

What is "standard AF points" in your mind?

Standard AF points check contrast Vertically. F/5.6 Active

Crosstype AF points check Contrast Horizontally and Vertically. F/4 Active

Double Crosstype AF points check Contrast Horizontally,Vertically, and Diagonally. F/2.8 Active

Here is a diagram if you dont fully understand.
http://www.cambridgeincolour.com/tutorials/camera-autofocus.htm

 

[dengor]

When you at 2.8 you have 36 points with 5.6 accuracy, 20 points with 4.0 accuracy and 5 points with 2.8 accuracy, right? And if you try to shoot at any point except 5 in center you get in roulette at close distances.

 

[RLPhoto]

When you at 2.8 you have 36 points with 5.6 accuracy, 20 points with 4.0 accuracy and 5 points with 2.8 accuracy, right? And if you try to shoot at any point except 5 in center you get in roulette at close distances.

 

[dengor]

What is wrong? Do you understand the word "accuracy"? All points works at 2.8, but AF accuracy is different.

 

[bdunbar79]

What is wrong? Do you understand the word "accuracy"? All points works at 2.8, but AF accuracy is different.

I don't think you have the definitions/understanding. DOUBLE Cross type is different than cross type. You have more cross types in the 1DX than the 1D4. That's the whole point of the camera. It's much better in AF.