Canon 550EX - 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
1
On the master unit, press the
button and select
EESBI.
• Pressing the button changes
the selection in the following loop:
® B H i E l - ►
------------ (Off)
2
3
Press the < —> button to select
ON A:B.
. ufiiiia ON A;B will blink
Press the button again
to select MMiw ON A:B C.
. ■iiiUBi A:B C will blink
67