From Capture Integration's Technical Department:
This is a little published, hidden function on PW3. Certain settings are required.
The particular settings are as follows:
- Set Transmitter and Receiver to any channel above 16
- Set Receiver to HSR
- Turn off A, B, C, and D groupings on receiver
When these settings are applied, you will see an "F" appear next to the channel number. This indicates that the Pocket Wizard is ready for the high sync speed.
Keep in mind that this is for leaf shutter lenses only, and cannot be used with focal plane shutters, even with equivalent shutter speeds. This technique cannot be applied to flashes or power packs with built in Pocket Wizards, as most of the changes have to be set to the receiver.