Canon Speedlite 430EXIII-RT Instruction Manual page 42

Flash Control from the Camera's Menu Screen
Flash firing
To perform flash shooting, set to [Enable]. To use the flash's AF-
assist beam only, set to [Disable].
E-TTL II flash metering
For normal exposures, set it to [Evaluative]. If [Average] is set, the
flash exposure will be averaged for the entire scene metered by the
camera. Flash exposure compensation may be necessary
depending on the scene. This setting is for advanced users.
Flash synchronization speed in Av mode
You can set the flash synchronization speed when shooting in
aperture-priority AE (W) mode with flash.
Flash mode
You can select [E-TTL II] or [Manual flash] according to your
shooting objective.
Shutter synchronization
You can select the flash firing timing/method from [1st curtain], [2nd
curtain], or [High-speed synchronization]. To perform normal flash
shooting, set [1st curtain].
Flash exposure compensation
In the same way as normal exposure compensation, you can set
exposure compensation for flash. The flash exposure compensation
amount can be set up to ±3 stops in 1/3-stop increments.
Zoom (flash coverage)
You can set the Speedlite flash coverage. When [Auto] is selected,
the flash coverage is set automatically according to the focal length
of the shooting lens and the image sensor size of the camera (p.22).
[Flash firing] and [E-TTL II flash metering] are displayed in step 2 or
step 3 on page 40. (Display layouts and procedures vary by camera
model.)
When [Flash sync. speed in Av mode] is not displayed, it can be set
with the camera's Custom Functions.
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