Canon EOS 7D - Manual (Page 127)

127
Using Wireless FlashN
Multiple Speedlite slave units can be treated as one flash unit or
separated into slave groups whose flash ratio can be set.
The basic settings are shown below. By changing the [Firing group]
setting, you can shoot with various wireless flash setups with multiple
Speedlites.
Basic settings:
Flash mode : E-TTL II
E-TTL II : Evaluative
Wireless func. : 0
Channel
: (Same as slave units)
[1 (A+B+C)] Using multiple slave Speedlites as one flash unit
Convenient when you need a
large flash output. All the
slave Speedlites will fire at the
same output and controlled to
obtain a standard exposure.
No matter what the slave ID is
(A, B, or C), all the slave units
will fire as one group.
Set [Firing group] to
[1 (A+B+C)], then shoot.
Fully-automatic Shooting with Multiple External Speedlites
80
o
Approx. 7m
(23.0ft.)
Approx.
5m (16.4ft.)
Approx.
7m
(23.0ft.)
Approx. 10m
(32.8ft.)
Indoors
Outdoors