Canon 550EX manual Press the button to select, Press the button again To select on AB C

Wireless E-TTL Autoflash With Flash Ratio ON

The following wireless E-TTL autoflash procedure is for a master unit with three slave units. This procedure sets the A:B flash ratio and the flash exposure compensation amount for slave unit C.

•The flash ratio range for A:B is the same as when only two slave units are used.

•Flash exposure compensation with slave unit C can be set up to ±3 stops in 1/3 or 1/2-stop increments.

•The slave ID of the slave unit on the camera’s left is A.

•The slave ID of the slave unit on the camera’s right is B.

•The slave ID of the slave unit illuminating the background is C.

•Master flash OFF is set for the master unit.

•The camera (attached with the master unit) and three slave units are properly positioned for the subject.

1 On the master unit, press the

< > button and select

.

• Pressing the < > button changes the selection in the following loop:

(Off)

2 Press the < > button to select

ON A:B.

• ON A:B will blink.

3 Press the < > button again

to select ON A:B C.

• A:B C will blink.

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