Well it determine how fast a shutter can be open when a flash fires. Most cameras are limited to 1/250 with matching brand flashes and cameras. (Nikon to Nikon, etc.) if you want to use your off brand flash or radio remote trigger with your Nikon body you'll be even lower with a shutter speed of 1/125. Other brands like Canon's are the same way some even require you to drop to 1/60 of a second to xsync.
This can be quite troublesome if your subject is moving; say on a skateboard, or there is movement behind them or maybe you want to balance sunlight and flash.
With the Fuji X100 it's xsync tops out at 1/1000 for most Fstops. This is wonderful. I read this on a blog post and immediately grabbed my gear and went out to test it out.
Get exposure for Bright sunny day (check) ISO 200, F4.5 @ 1/1000 same for all the camera exposures.
Then set up my SB-26 with a PocketWizard and my trusty umbrella. No subjects around so I step in (sorry to ruin the moment). That's me standing in the shadow of my umbrella and the flash firing.
I got closer so you could see the sun hitting me and the flash. Look at my pant at the bottom of the photo. Ooohhh!! Both sunlight and flash exposure....
Yes it xsync at 1/1000 of a sec!!!! or I'd be nothing but a big dark silhouette.
That is 3 stops more to use for stopping motion or balancing sunlight and flash portraits. Which look great with this 60" umbrella.
Here's the info on the back of my SB-26 for what I was using on it. (this the macro mode on the X100. I was about 2 inches away)
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