Nikon D810 - Manual (Page 354)

330
❚❚ 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, 0 329), 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 (0 430) can be used at any
shutter speed (Auto FP High-Speed Sync).
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 /
8000
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 flash 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.