Nikon D800 - Manual (Page 324)

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300
U
❚❚Auto FP High-Speed Sync
When 1/320 s (Auto FP) or 1/250 s (Auto FP) is selected for
Custom Setting e1 (Flash sync speed,
0 299), the built-in flash can
be used at shutter speeds as fast as 1 /
320
s or 1 /
250
s, while
compatible optional flash units ( 0 382) can be used at any shutter
speed (Auto FP High-Speed Sync).
This option determines the slowest shutter
speed available when using front- or rear-
curtain sync or red-eye reduction in
programmed auto or aperture-priority auto
exposure modes (regardless of the setting
chosen, shutter speeds can be as slow as 30 s
in shutter-priority auto and manual exposure modes or at flash
settings of slow sync, slow rear-curtain sync, or red-eye reduction
with slow sync). Options range from
1 /
60
s (1/60 s) to 30 s (30 s).
Flash sync speed 1/320 s (Auto FP) 1/250 s (Auto FP) 1/250 s
Shutter speed
Built-in
flash
Optional
flash unit
Built-in
flash
Optional
flash unit
Built-in
flash
Optional
flash unit
From 1 /
8,000
to but
not including 1 /
320
s
— Auto FP — Auto FP — —
From 1 / 320 to but not
including 1 / 250 s
Flash sync * — Auto FP — —
1 /
250
–30 s Flash sync
* Flash range drops as shutter speed increases. Flash range will nevertheless
be greater than that obtained at the same speeds with Auto FP.
D
The Flash-Ready Indicator
When the flash fires at full power, the flash-indicator in the camera
viewfinder will blink to warn that the resulting photograph may be
underexposed. Note that the flash-ready indicators on optional flash
units will not display this warning when 1/320 s (Auto FP) is selected.
e2: Flash Shutter Speed
G button ➜ A Custom Settings menu