Canon Speedlite 430EXIII-RT Instruction Manual page 97

<k> is displayed.
Set the shutter speed 1 stop slower than the flash sync speed (p.49).
The LCD panel illumination turns on and off.
The master unit's LCD panel illuminates or turns off according to the
charge status of the master unit and slave units (firing groups). See
"LCD Panel Illumination" on page 54.
Linked Shooting
Standard exposure is not obtained /
Uneven exposure occurs.
If you fire multiple Speedlites at the same time during linked
shooting, the appropriate exposure may not be obtained or uneven
exposure may result. It is recommended to set only one Speedlite to
fire or to use a self-timer to space out the timing of the flashes.
Optical Transmission Wireless Flash Shooting
The slave unit does not fire.
Set the slave unit to <:x> (p.73).
Set the transmission channels of the master unit and slave unit to
the same numbers (p.73).
Check that the slave unit is within the transmission range of the
master unit (p.72).
Point the wireless sensor of the slave unit toward the master unit (p.72).
If the master unit and slave unit are too close, the transmission may
not take effect properly.
When using the camera's built-in flash as the master unit, raise the
camera's built-in flash, and set [Wireless func.] on the camera's
[Built-in flash func. setting] screen.
Troubleshooting Guide
97