Quantum Copilot Canon for Canon DSLR cameras (QF91C)
CoPilot is a user friendly wireless TTL Flash Controller With Auto-Focus  Assist. CoPilot (QF91C) for Canon & CoPilot (QF91N) for Canon DSLR  cameras. Photographers can now trigger and quickly set ratios for three  groups of radio controlled Qflash. Set lighting ratios on the fly, right  from your camera. Simply turn three controls on the CoPilot to  instantly adjust lighting ratios as you shoot. The CoPilot controls 3  independent remote flash groups without a local flash, or 2 remote  groups with a local Qflash connected to the CoPilot accessory socket.  Each flash group can be set to Manual or TTL. Power and ratio settings  are easily controlled by a dial for each flash group. Good news for  photographers still using their older Qflashes (T2D,T3D T4D, T5D). The  CoPilot gives you the ability to use your old flash as a local flash  while still getting the TTL ratio control of remotes offered by the  newer T5dR and TRIO. Remote flash groups consist of Quantum TRIO, Qflash  T5dR, or any non-Quantum flash that can be triggered in Manual and Auto  mode only, by a FreeXwire wireless receiver. Add any number of remotes  to any remote group. Mix and match all the flashes you own. CoPilot  controls remote Qflash TRIOs or T5dRs. And it triggers any combination  of non-Quantum flashes connected to a Quantum FreeXwire receiver.