Paulthelefty Offline Upload & Sell: Off
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I think it is important to realize you are showing an instant in time, which does not really give us any info on how you are tracking the subjects, who in almost every case appear to be moving. While the focus point is indeed on the intended subject, where was that point a millisecond prior? Based on your results with backgrounds nicely focused, I would presume the point was NOT on your intended target and that is where the camera locked.
In the first three, I can picture the scenario: tracking the player, he jukes, you don't, focus grabs something behind, and you're done. The third photo the point is on his lower leg...
4 through 6 you were tracking the ball, and even though in 6 he has moved past, the camera still had that focus point when you clicked. In 5, he checked up for the jump, and you tracked past him and that is when/where the camera focused. I am not super familiar with the 1DX surrounding point so focus, but this could be part of what is happening here as well. Theoretically the last shot should be fine with surround, but depending on how well you were tracking and when you started tracking, it may have tracked the background... My understanding is the camera will grab the center point and transfer that tracking to surrounding points , so if you happened to grab at that last one rather than steady tracking, it may have tracked the background intentionally.
It certainly is frustrating to come from a tough sport like volleyball where you think you have everything nailed, and find you are having all kinds of problems. I would suggest that basketball is harder ,because of the full court coverage, than volleyball which is mostly contained in a smaller area (depending on how you shoot and what you are trying to capture and how well you know the sport and the individual players, of course).
I honestly don't see anything unusual here, especially considering the lighting and as you say, the first games of the season so new players, and perhaps a bit of rustiness... :-)
Since I do not know the 1DX focusing system (still on a 7D), I cannot offer more advice on ideal setup, but I am sure others will chime in with what works for them. I do know for basketball I push my tracking faster and depending on where I shoot from, I may or may not adjust my tracking hold time faster than default. I almost always use single point, for me using surrounding points tend to jump off faster when I have other players crossing in front of my intended subject.
All IMHO...
Paul
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