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With the camera, canon 5D mark III, set on 61 point automatic selection AF in AI servo in the horizontal position the camera behaves as I expect once it has a focused on an object and the camera is moved ( to simulate the object moving) the active focus point moves to stay on the selected object and keep focus.
When the camera is rotated to the vertical position it seems to behave differently and once an object has been focused on if the camera is moved ( to simulate the object moving) it does not try to keep focus on that object but changes focus to where the one focus point in the camera is looking.
My question is twofold. Is this behavior, explanation correct and does the 1DX behave the same way.