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===Limited Compatibility, No TTL===

[[File:FEC_table.png|right]]

TTL is not currently available for the 1D X, 6D, or Rebel T4i with ControlTL radios. Manual power control for X-sync, manual power control for HSS, HyperSync, and Rear Curtain Sync are all available. An [[AC3 ZoneController]] with the zone set to “M” for Manual, and manual power control of compatible flashes like Einstein E640, AlienBees,
White Lightning, and select Elinchrom flashes will also work.

Manual-Only Operational Considerations:
* For remote manual power control to work, remote Speedlites on FlexTT5 radios must be set to TTL, as is normal operation for the ControlTL system.
* A Master Speedlite on the camera’s radio set to E-TTL mode will not trigger. Any remote zones set to TTL will not trigger. 
* A Master Speedlite on the camera’s radio set to manual mode, with or without remote manual zones, will function normally. 
* The Canon 600EX-RT Group and ALL modes are not supported in the ControlTL system for any Canon cameras, including the 1D X, 6D, and T4i. Master Manual Mode works properly with these cameras. 
* An AC3 ZoneController will not trigger any zones set to A for either TTL remotes (Speedlites) or PowerTracking studio remotes. 
* If the 1D X, 6D, or T4i are woken up with a very quick full-press of the camera’s shutter release, flashes may misfire or clipping may occur. Try to always wake the camera with a slow, deliberate half-press of the shutter release before taking the exposure. On the 1D X, consider setting C.Fn6 (“Timer Duration”) to 1 min or longer to keep the camera awake longer after a full-press.
* When using a bare shoe FlexTT5 or MiniTT1 on the 1D X, 6D, or T4i (no Master Speedlite and no AC3 ZoneController), the camera’s FEC adjustment can adjust the manual power of remote Speedlites or studio flashes per the table to the right ->
* This adjustment is not real time. To apply an FEC adjustment, either wait for the camera to sleep, and then wake it with a half-press of the shutter release button, *or* press the FEC button, make your adjustment, and then press the FEC button again to “set” the adjustment. 
* On cameras other than the 1D X, 6D, or T4i, using a bare shoe MiniTT1 or FlexTT5 (no AC3 ZoneController or Master Speedlite) would cause the remote flashes to be used as TTL flashes, with FEC controlling compensation to output power in real time. 
* Only the “Full Manual” PowerTracking mode is available for the 1D X, 6D, and T4i. If other PowerTracking modes, like “Center on ISO & Aperture” are selected, they will perform as “Full Manual.” “No Change (Trigger Only)” will work as expected.