What is Auto FP High-Speed Sync?

Indispensable to outdoor photography, Auto FP High-Speed Sync enables action-stopping shutter speeds with fill flash. This function is also important for portraiture, allowing the use of larger apertures for a more pleasing radiant ambient light and soft backgrounds to eliminate distractions. 

If your camera is compatible with Auto FP High-Speed Sync (see camera chart below), it switches on automatically when shutter speeds above 1/250th second are used for flash photography.

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Auto FP High-Speed Sync Flash 
@ 1/1250 sec, f/8, ISO 400

Auto FP High-Speed Sync Flash 
@ 1/1250 sec, f/8, ISO 400


How does Auto FP High-Speed Sync work?
When using normal flash the Speedlight emits one burst of light when the shutter is fully open.

 
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Front shutter curtain opens

Flash sync when shutter is fully open

Rear shutter curtain closes


Auto FP High-Speed Sync provides a series of light pulses that provide consistent and even light as the shutter travels. 

This strobing action takes a large amount of flash power. The amount of light reaching the sensor reduces the faster the shutter speed set. Often the reduction in power does not noticeably affect the image, but when it does, photographers often compensate by either moving closer to their subjects or using more than one Speedlight. 

 
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Cameras compatible with Auto FP High-Speed Sync

Camera

Maximum Shutter Speed compatible with Auto FP High-Speed Sync*

Z 5, Z 6, Z 6II, Z 7, Z 7II, Z 50, D6, D5, D4 series, D3 series, D2 series, Df, D80, D90, D200, D300 series, D500, D600, D610, D700, D750, D780, D800 series, D810 series, D850, D7000, D7100, D7200, D7500 and F6

Sync. up to the maximum shutter speed of the camera**

D1X, D1H, D1, D40 series, D50, D60, D70 series, D100, D3000 series, D5000 series

Does not support Auto FP High-Speed Sync.


*Not all Speedlight’s support Auto FP High-Speed Sync mode please refer to the Speedlight User Manual for details.
**In i-TTL, AA, A, GN, and M Speedlight modes only. 

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