Straighten - Nikon Z 8 Reference Manual

Straighten

Rotate pictures by up to ±5° in increments of approximately 0.25°.
The effect can be previewed in the edit display. To view the
unedited picture, press and hold the DISP button.
The greater the rotation, the more will be trimmed from the
edges.
Press 1 or 3 to choose the amount of straightening performed.
Press J to save the retouched copy.
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Straighten