Canon 550 EX - Manual (Page 67)

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.
On the master unit, press the
<
> button and select
.
• Pressing the < > button changes
the selection in the following loop:
Press the < > button to select
ON A:B.
• ON A:B will blink.
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Press the < > button again
to select ON A:B C.
• A:B C will blink.
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(Off )
05. F073-E (51~) 02.4.1 2:12 PM Page 67