I recently bought a PocketWizard Mini TT1 and a Flex TT5. When attaching a 430EX on the FlexTT5, I can set the shutter at 1/8000 and still get a correct exposure thanks to HyperSync.
However, when attaching the 430EX on top of the TT1 (so, on-camera with the TT1 in between and without using the TT5), the camera doesn't let me choose shutter speeds faster than 1/200, as if there was no HyperSync.
With the TT5 this works (on-camera). Is this by design? Do I need to use the Flex to get HyperSync on the camera-mounted flash (with or without additional radio-triggered flash)?
EDIT: as it seems also the TT5 forces 1/200 after the first calibration shot.
I'd prefer to use the MiniTT1 in such a configuration as it is much smaller...