Canon Speedlite 430EX III-RT - Manual (Page 58)

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a : Fully Automatic Wireless Flash Shooting
Flash exposure compensation and other settings set on the master unit
will be set automatically on the slave unit(s). You do not need to operate
the slave unit(s). Wireless flash shooting with the following settings can
be performed in the same way as in normal flash shooting.
You can use two or more master units (master units + slave units =
maximum of 16 units). By preparing multiple cameras with master units
attached, you can perform wireless flash shooting by changing cameras
while keeping the same lighting (slave units).
Note that when using two or more master units, the color of the <
D >
lamp varies depending on the order in which the power was turned on.
The first master (main master) is green, and the second and
subsequent masters (sub-masters) are orange.
Advanced Shooting with Fully Automatic Wireless Flash
• Flash exposure compensation
( f /p.24)
• High-speed sync
( c /p.26)
• FE lock (p.25) • Manual flash (p.34, 62)
Master Units
You can also directly operate the slave unit to separately set flash
exposure compensation and flash coverage on each slave unit.
You can also perform FEB shooting and stroboscopic flash using the
430EX III-RT set as a slave unit with a master unit equipped with FEB
and stroboscopic flash functions.
If the < D > lamp is red, the connection has not been established. After
checking the transmission channel and wireless radio ID, turn each master
unit off and on again.
You can take pictures regardless of the main master and sub master status.