Canon EOS REBEL T7i Instruction Manual page 444

Troubleshooting Guide
The built-in flash rises by itself.
In shooting modes (<A> <C> <2> <4> <8: qC6>

<v: GWXZH>) whose default setting is <a> (Built-in autoflash),
the built-in flash will be raised automatically when necessary.
In the <8: xG> and <v: ABCD> modes, when you

press the shutter button halfway under low-light conditions, the built-in
flash may be raised automatically and emit the AF-assist beam.
The built-in flash does not fire.
If you use the built-in flash too often in too short a period of time, the

flash may stop firing for a while to protect the light-emitting unit.
The external flash always fires at full output.
If you use a flash unit other than an EX-series Speedlite, the flash will

always be fired at full output (p.210).
Under [z2: Flash control], if [Flash metering mode] in [External

flash C.Fn setting] is set to [TTL flash metering] (autoflash), the
flash will always be fired at full output (p.216).
Flash exposure compensation cannot be
set for the external Speedlite.
If flash exposure compensation is set with the external Speedlite,

compensation amount cannot be set with the camera. When the
external Speedlite's flash exposure compensation is canceled (set to
0), flash exposure compensation can be set with the camera.
High-speed sync cannot be set in the <f> mode.
Under [z2: Flash control], set [Flash sync. speed in Av mode] to

[Auto] (p.212).
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