You connect it to your system via the USB port for set it up for high speed shooting.
You will have to experiment with different prefs and unfortunately they will be different for every different camera model.
The only down side is that hot shoe flashes have less power than studio models.
This leads to less power output from the flash.
We recommend this system for shooting sports like skateboarding, mountain biking, etc.
The flashes also need to be pretty close to the camera.
Canon’s original 1D, Nikon’s D40, D50 and D70 are all good examples.
The interval of time that the sensor is on is actually your shutter speed.
The only problem is that they are pretty old and have just 4 to 6 mega pixels resolution.
Nikon’s P7000 also has the same option.
They have the ability to sync up to 1/2000th of a sec and also shoot RAW images.
Flash duration is the time that the bulb of the flash says on for.
