Yup it is possible!


you can mount the ST-E2 on top of the mini or flex (on camera) and fire off another flextt5 (wirelessly).


Here is the cool thing, you can use ABC zones and ratio controls wirelessly since the minitt1/flextt5 reads in the info from the ST-e2 and transmits the TTL info wirelessly.


I have the Pocket Wizard Flex and mini setup (with the AC5 sock which eliminates all RF noise with the latest firmware 4.374) and works awesome!


-e