Nikon D4 - Manual (Page 326)

300
U
“Vignetting” is a drop in brightness at the edges of a photograph.
Vignette control reduces vignetting for type G and D lenses (DX
and PC lenses excluded). Its effects vary from lens to lens and are
most noticeable at maximum aperture. Choose from High,
Normal, Low, and Off.
Vignette Control
G button
➜ C shooting menu
A
Vignette Control
Depending on the scene, shooting conditions, and type of lens, TIFF
and JPEG images may exhibit noise (fog) or variations in peripheral
brightness, while custom Picture Controls and preset Picture Controls
that have been modified from default settings may not produce the
desired effect. Take test shots and view the results in the monitor.
Vignette control does not apply to movies (
0 63), multiple exposures
( 0 210), or photographs recorded with a DX lens or DX (24 Ч 16) 1.5 Ч
(DX format) selected for image area ( 0 85).