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You can divide the slave units into two or three groups and perform E-TTL II/E-TTL autoflash
while changing the flash ratio (factor). In addition, you can set and shoot with a different flash
mode for each firing group, for up to 5 groups.
● Auto Shooting with Two Slave Groups
● Auto Shooting with Three Slave Groups
Wireless shooting using radio transmission has advantages over wireless shooting using optic
transmission, such as being less affected by obstacles, and not having to point the slave unit's
wireless sensor toward the master unit. The main functional differences are as follows:
Function
Distance
Channel
A/B/C Power
Radio Transmission
100m
1~32
OFF，1/128~1/1
Optic Transmission
15m
1~4
1/128~1/1
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