Nikon D300 Flash Control at [1/320 s (Auto FP)], DThe Flash-ReadyIndicator, D[1/320 s (Auto FP)] and Flash Range

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).

Flash sync speed	[1/320 s (Auto FP)]		[1/250 s (Auto FP)]		1/250 s
	Built-in	Optional	Built-in	Optional	Built-in	Optional
Shutter speed	flash	flash unit	flash	flash unit	flash	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

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.

DThe 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.

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