用的是老的Nikon 28DX。。。不过找到了一些答案，我回去试试。

估计很难与Cactus 无线trigger连在一起用。个人觉得1/250也差不多够了。 好像很多机器 （D1， D300）对FP high speed 设置很挑剔，SB-600 到900 也只能在manual 模式。 奇怪的是那些入门级别的机器反而很好，D40可以到1/1000，而且与Cactus无线trigger工作的也很好。

1. https://nikoneurope-en.custhelp.com/app/answers/detail/a_id/1473/~/fp-high-speed-sync

2. http://www.kenrockwell.com/nikon/*****28.htm

Those FP sync speeds faster than 1/250 are a hoax.

I don't know if an N80 or N65 can do it, but I never use it anyway with F100.

This mode only works with a lot of manual fooling around. To use the FP modes you have to calculate f/stops manually using guide numbers for each distance! You have to look at the distance on your lens, look at the calculator on the rear of the flash and then set the indicated aperture on your lens. You also loose a lot of flash power and therefore this mode sucks a lot of batteries, takes a long time to recycle and has a small maximum shooting distance.

I've never even tried used this mode, so I'd forget about it.

Ever notice how the photos Nikon uses to illustrate this feature are always with a subject at a fixed distance, like of a water skier on the end of a fixed rope or made from a camera attached to a race car?

The real camera sync speed of 125 or 250 is significant. The FP mode, for me, isn't