The shift function can be used to correct converging verticals.
Even with a full 12mm of shift one might still need to angle the camera upwards, but the shift effect is nonetheless an improvement.
In fact, correcting about 25% less than full correction can be aesthetically more pleasing. In other words, if 12mm fully corrects the converging verticals, then 9mm of shift might be a more pleasing and natural look.
In this example, the full 12mm of shift was used, and the camera was still angled sharply up (tall tower, relatively close shooting distance).
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