Canon 550EX User Manual
Page 67
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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
EESBI.
• Pressing the
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
to select MMiw ON A:B C.
. ■iiiUBi A:B
C will blink
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