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There are a couple of other things that might be in the mix here as well, but difficult to determine based on what has been provided. Where was the focal point located? Were you using one or multiple focal points? Were you standing or sitting? Were you locked on to the player PRIOR to shooting? BTW: Solid black jerseys are no friends to AF Do you have other examples on higher contrasting targets that have given you similar results?
- agree with Paul, that heat waves maybe at work here, with standing up being the only help
- also agree you should AFMA your rig & I would start with the DotTune method (remember to use 50 x 300 x 1.4 for the distance ie 69ft, no wind, bright sunny day etc...) When done shoot another high contrast detailed target at approximately the same distance and review the results, it should be very sharp!
With what you've indicated I highly suspect this particular 1D-X combo needs microadjusting. I will be interested to hear how much AFMA you come up with.