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Tim Ashton wrote:
Standard focus mode questions (AF-S/C/A, how many points etc) - can easily see that happening if you have too wide a focus area selected.
AF-S. Focus lock release. 21 point. Operator selected focus point. Placing active focus point on either left or right eye.
I find that it's best to use the minimum number of points necessary - I only use 21 point when I have low confident in my ability to track movement across the frame as increasing the number of points slows down focus a bit and more importantly, often increases the number of viable targets for the AF system to choose. The dynamic modes aren't as strict about choosing the closest viable target as the other modes. Those two things could in a bright scent cause the camera to select a different focus point, and you saying it's fine at short distances reinforces my thoughts in that direction.
That said, it could be a body fault, but I'd drop to single point AF-C for portraits (keeping focus priority) and see if that makes a difference). 21 point needlessly introduces extra variables (unless your subjects are unpredictably moving around the frame a lot).