Canon MACRO RING LITE MR-14EX II Mode D'emploi page 46

: Wireless Multiple Flash Shooting
Using an EX-series Speedlite equipped with optical transmission
wireless slave function, you can easily perform wirelessly-controlled
photography lit with multiple flashes.
The system is designed so that the settings of the MR-14EX II (master)
attached to the camera are automatically applied to the slave flash unit.
Therefore, you do not need to operate the slave unit while shooting. You
can then perform wireless multiple flash shooting, using E-TTL II/E-TTL
autoflash by simply setting the master unit to <a>.
Positioning and Operation Range
(Wireless multiple flash shooting examples)
Multiple flash shooting with slave C added
You can perform multiple flash shooting, using flash tubes A and B
of the master unit and a slave unit set to firing group C (slave C).
Slave C is automatically controlled to obtain a standard exposure by
firing group C alone. Therefore, it can be used to eliminate shadows
on the subject or create an accent light.
M
Transmission range
44
Indoors
C
Outdoors
Approx. 80°
Approx. 3 m
(9.8 ft.)
(p.49)
Approx. 5 m
(16.4 ft.)