Canon EOS Rebel T6 Instruction Manual page 199

[Built-in flash func. setting] and [External flash func. setting]
With [Built-in flash func. setting] and [External flash func. setting],
you can set the functions in the table below. The functions displayed
under [External flash func. setting] vary depending on the Speedlite
model.
[Built-in flash func. setting] and [External flash func. setting] Functions
Function
Flash mode
Shutter synchronization
FEB*
Flash exposure
compensation
E-TTL II flash metering
Flash zoom*
Wireless functions*
* Regarding [FEB] (Flash exposure bracketing), [Zoom], and [Wireless func.],
refer to the Speedlite's instruction manual compatible with the function.
Cautions for Radio Transmission Wireless Flash Shooting

• Radio transmission wireless flash shooting cannot be set with the
camera. Use the Speedlite to set the function.
• Set flash sync speed to 1/100 or less.
• High-speed synchronization is not possible.
• Group flash is not possible.
The camera may not be able to set some of the functions of [Flash

mode], [Zoom], and [MULTI flash], depending on the Speedlite model
used. In such a case, use the Speedlite to set the functions.
Select [Built-in flash func. setting]

or [External flash func. setting].
 The flash functions will be displayed.
The highlighted functions can be
selected and set.
[Built-in flash func.
setting]
E-TTL II (Fixed)
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3 Setting the FlashN
[External flash func.
setting]
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