Canon 550 EX - Manual (Page 69)

Wireless E-TTL Autoflash With Flash Ratio ON
Press the < > button to
register the setting.
• The flash ratio bar and A:B:C
remain displayed.
• To change the flash exposure compensation
amount, repeat steps 8 to 10.
Follow the basic procedure for
wireless E-TTL autoflash on page 60
and take the picture.
● Slave Groups
Multiple slave units having the same
slave ID will be recognized and
controlled as one slave group. The group
will be treated as one slave unit.
• In the left figure, the slave ID is A for all three
slave units. They will be controlled as slave unit A
even as a group.
69
A Slave Group
10
11
• Even if you have slave units A, B, and C, if only A:B is selected, slave unit C
will not fire.
• If slave unit C is used to illuminate the subject directly, overexposure may result.
05. F073-E (51~) 02.4.1 2:12 PM Page 69