Canon EOS Rebel T6i W Instruction Manual page 178

3 Setting the FlashK
Setting the External Speedlite Custom Functions
The Custom Functions displayed under [External flash C.Fn setting]
vary depending on the Speedlite model.
With an EX-series Speedlite, if the [Flash metering mode] Custom Function is
set to [TTL flash metering] (autoflash), the Speedlite will always fire at full output.
Clearing the Settings
The Speedlite's Personal Function (P.Fn) cannot be set or canceled with the
camera's [Flash control] screen. Set it with the Speedlite.
178
Display the Custom Function.
1
With the camera ready to shoot with

an external Speedlite, select
[External flash C.Fn setting], then
press <0>.
Set the Custom Function.
2
Press the <Y> <Z> keys to select the

function number, then set the function.
The procedure is the same as setting the
camera's Custom Functions (p.336).
Select [Clear settings].
1
Under the [z1: Flash control] tab,

select [Clear settings], then press
<0>.
Select the settings to be cleared.
2
Select [Clear built-in flash set.],

[Clear external flash set.], or [Clear
ext. flash C.Fn set.], then press <0>.
When you select [OK], the respective

flash settings will be cleared.