Left pic of pair taken with camera rotated on axis through a nodal point
in the lens. Note how space between foreground pole and background
bush to its right is the same in both pix.

Curve in the pole shows the barrel distortion of this lens (Tokina ATX242) at
this focal length (24mm).

Note: these examples are in "landscape" orientation to accentuate the difference
in perspective. However, pics taken with the bracket use portrait orientation.