With the Quantum Instruments CoPilot Wireless TTL Flash Controller for Canon you can control a studio full of flashes from up to 300 away from the hotshoe of your Canon DSLR. Not only will the CoPilot trigger them but can adjust the lighting ratios of up to 3 independent groups of flashes. Instead of poking away at an LCD screen Quantum gives you ergonomic, tactile dials that you can adjust without looking at them once you get used to their functions. The CoPilot is compatible with current Qflash TRIOs and T5dRs as well as older versions and any non-Quantum flash that can be triggered in Manual and Auto mode only by a FreeXwire wireless receiver. Last but not least, the CoPilot has a built-in IR autofocus assist for fast focus in low light.CoPilots infrared autofocus assist helps your camera focus in low lightTTL control of up to 3 independent groups of flashes without a local flash or 2 remote groups with a local Qflash connected to the accessory connector of CoPilot. Compatible with Quantum TRIO and T5dR and older T2D,T3D, T4D and T5D versionsTrigger non-Quantum flash in manual or auto mode with FreeXwire FW8R or FW10W receiversUse any number of flashes in each remote groupInstant dial settings replace complicated LCD displayReliable digital radio wireless up to 300 (100 m)