Nikon D300 User Manual page 315

Flash Control at [1/320 s (Auto FP)]
When [1/320 s (Auto FP)] is selected for Custom Setting e1 ([Flash
sync speed], pg. 288), the built-in flash can be used at shutter
speeds as fast as
SB-R200 flash units can be used at any shutter speed (Auto FP
High-Speed Sync).
Flash sync speed [1/320 s (Auto FP)]
Built-in
Shutter speed
1 1
/ – / s
8,000 320
1 1
/ – / s
320 250
1
/ –30 s
250
D
[1/320 s (Auto FP)] and Flash Range
When [1/320 s (Auto FP)] is selected for Custom Setting e1 at shutter
1
speeds between
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.
1
/ s, while optional SB-900, SB-800, SB-600, and
320
Optional
flash flash unit
— Auto FP
Flash sync
1
/ s and / s , flash range will drop as shutter speed
250 320
[1/250 s (Auto FP)]
Built-in Optional
flash flash unit
— Auto FP
— Auto FP
Flash sync
1/250 s
Built-in Optional
flash flash unit
— —
— —
U
289