Nikon D5 - Manual (Page 140)

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This option is used to correct “red-eye” caused by the flash, and is
available only with photographs taken using the flash. Note that
red-eye correction may not always produce the expected results
and may in very rare circumstances be applied to portions of the
image that are not affected by red-eye; check the preview
thoroughly before proceeding.
Create a straightened copy of the selected
image. Press
2 to rotate the image clockwise
by up to five degrees in increments of
approximately 0.25 degrees,
4 to rotate it
counterclockwise (the effect can be
previewed in the edit display; note that edges
of the image will be trimmed to create a square copy). Press
J to
save the retouched copy.
Red-Eye Correction
G button
➜ N retouch menu
Straighten
G button
➜ N retouch menu