©PPA
At 10mm there is no visible lens distortion in the vertical lines of this cityscape.
©PPA
Same camera position at 10mm
©PPA
If an APS-C crop has not been applied to a full-frame capture, pincushioning is visible in the outer 20% of the left and right sides.
©PPA
Without the APS-C crop applied to a full-frame camera capture, you will see the lens hood at the corners.