Nikon D800 User Manual (en)

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Flash Modes
The D800 supports the following flash modes:
Flash mode
Description
Front-curtain 
sync
This mode is recommended for most situations. In 
programmed auto and aperture-priority auto modes, 
shutter speed will automatically be set to values 
between 
1
/
250
 and 
1
/
60
s (
1
/
8,000
 to 
1
/
60
s when an optional 
flash unit is used with Auto FP High-Speed Sync; 
Red-eye 
reduction
Red-eye reduction lamp lights for approximately one 
second before main flash. Pupils in subject’s eyes 
contract, reducing “red-eye” effect sometimes caused by 
flash. Owing to one-second shutter-release delay, this 
mode is not recommended with moving subjects or in 
other situations in which quick shutter response is 
required. Avoid moving camera while red-eye reduction 
lamp is lit.
Red-eye 
reduction with 
slow sync
Combines red-eye reduction with slow sync. Use for 
portraits taken against a backdrop of night scenery. 
Available only in programmed auto and aperture-
priority auto exposure modes. Use of a tripod is 
recommended to prevent blurring caused by camera 
shake.
Slow sync
Flash is combined with shutter speeds as slow as 30 s to 
capture both subject and background at night or under 
dim light. This mode is only available in programmed 
auto and aperture-priority auto exposure modes. Use of 
tripod is recommended to prevent blurring caused by 
camera shake.
Rear-curtain 
sync
In shutter-priority auto or manual exposure 
mode, flash fires just before the shutter 
closes. Use to create effect of a stream of 
light behind moving objects. In programmed 
auto and aperture-priority auto, slow rear-curtain sync is 
used to capture both subject and background. Use of 
tripod is recommended to prevent blurring caused by 
camera shake.