Why are the distance readouts in the FocusTune grid different for some shots?

The different distances are because as the lens changes AF for the different AFA settings, the distance of the focus plane will change. Hence the different distances. The reason why the distances are a range and quite different, is that the lens carries this data in a text Look Up Table (LUT) with very limited resolution. So while the actual focus can be finely resolved the distance reading cannot and is not.

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