Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 167)

167
AF-Assist Beam Settings
Specify firing of the AF-assist beam from the camera’s built-in flash or an
EOS Speedlite.
1
Select [AF-assist beam firing].
z Under the [
z
] tab, select [AF-assist
beam firing] , then press < 0 >.
2
Select an item.
z Press the < W > < X > keys to select the
item, then press < 0 >.
z [ON] Enable
The AF-assist beam will be emitted when necessary.
Raise the flash to emit the AF-assist beam from the built-in flash.
z [OFF] Disable
The AF-assist beam will not be emitted. Set if you prefer not to emit the
AF-assist beam.
z [
1
] Enable external flash only
If an external Speedlite is attached, it will emit the AF-assist beam when
necessary.
z [IR] IR AF assist beam only
Enables infrared AF-assist beam emitting by external Speedlites
equipped with this feature, when these flash units are attached.
z Raising the flash in advance and setting [AF-assist beam firing] to [Enable]
is recommended in < A >, < 8 >, or < v > mode.
z No AF-assist beam is emitted by external Speedlites with their [AF-assist
beam firing] Custom Function set to [Disable] .