Nikon D800 User Manual (en)

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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 (
• The camera is currently in live view or a movie is being recorded.
• Off selected for Custom Setting a8 (Built-in AF-assist illuminator
(
• 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 (
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 (
• 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 (
•   Turn  Active D-Lighting off to avoid heightening the effects of noise 
(
Photos are blotched or smeared
:
• Clean  lens.
• Clean low-pass filter (
Colors are unnatural
:
• Adjust white balance to match light source (
• Adjust Set Picture Control settings (
Can not measure white balance
: Subject is too dark or too bright (