Nikon D700 - Manual (Page 302)

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Active D-Lighting
This option can be used to prevent loss of detail in highlights and
shadows (pg. 179). Choose from Auto, High, Normal, Low, and
Off (the default setting).
Vignette Control
“Vignetting” is a drop in brightness at the edges of a photograph.
Its effects vary from lens to lens and are most noticeable at
maximum aperture. Vignette control reduces vignetting for type
G and D lenses (DX and PC lenses excluded). Choose from High,
Normal (the default setting), Low, and Off.
A Vignette Control
Depending on the scene, shooting conditions, and type of lens, TIFF and
JPEG images may exhibit unevenness or variations in peripheral
brightness, while custom Picture Controls and Nikon 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 multiple exposures (pg. 198), DX-format images
(pg. 58), or images created with Image overlay (pg. 361). The effects of
vignette control can not be previewed in live view (pg. 89).