Nikon D800 - Manual (Page 438)

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AF-assist illuminator does not light :
• AF-assist lamp does not light if AF-C is selected for autofocus mode
( 0 91). Choose AF-S. If an option other than auto-area AF is selected for
AF-area mode, select center focus point ( 0 96).
• The camera is currently in live view or a movie is being recorded.
• Off selected for Custom Setting a8 (Built-in AF-assist illuminator)
( 0 286).
• Illuminator has turned off automatically. Illuminator may become hot
with continued use; wait for lamp to cool down.
Flicker or banding appear during live view or movie recording : Choose an option for
Flicker reduction that matches the frequency of the local AC power
supply (
0 329).
Bright bands appear during live view or movie recording : A flash or other light
source with brief duration was used during live view or movie recording.
Noise (bright spots, randomly-spaced bright pixels, fog, lines, or reddish areas) appears in
photos
:
• To reduce randomly-spaced bright pixels, fog, or lines, choose lower ISO
sensitivity or use high ISO noise reduction ( 0 109, 277).
• To reduce bright spots, randomly-spaced bright pixels, or fog at shutter
speeds slower than 1 s or to reduce reddish areas and other artifacts in
long time-exposures, enable long exposure noise reduction (
0 277).
• Turn Active D-Lighting off to avoid heightening the effects of noise
( 0 175).
Photos are blotched or smeared :
• Clean lens.
• Clean low-pass filter (
0 394).
Colors are unnatural :
• Adjust white balance to match light source ( 0 145).
• Adjust Set Picture Control settings ( 0 163).
Can not measure white balance : Subject is too dark or too bright ( 0 157).