Nikon D300 User Manual (en)

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