Canon Speedlite 550EX Instructions Manual page 67

Wireless E-TIl 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 lIash ralio rarlge lor A:B is the same as when only two slave units are used.
Flash eXPQsure compensation with slave unit C can be set up to ±3 stops in 113 or 1/2·stop
incremenlS.
The slave 10 01 the slave unit on the camera·s lett is A.
The slave 1 0 of the slave unit on the camera·s right is B.
The slave 1 0 01 th e slave unit illuminating the background is C.
Master flash OFF is set lor the maS1er unit.
The camera (attached with lhe master unit) and th ree slave units are properly positioned tor the
subject
ETTL
11iI~
..
nI
i')mm
- D '\::[,
\ 1/
."Z.'"i ~
.... TI\
'!i. '
({) MOO.
+
s" ,sn
ZOOM
cr ~ ~~,~
1
On t he master unit, press the
< SElISET ,. button and select
1lttmII.
- Pressing the <SEL /S ET ,. button changes
the selection in the lollowirlgloop :
rail . . . . .
"tl-+Ii1.liD-+~"'" ~ '"i ~
(Oft) ..
2
Press the <
-
,. button to select
DE!I
ONA:B_
• ..:rJIliI ON
A:B will blink.
3
Press the < SElISET ,. button again
to select
DE!I
ON A:B C.
• lIlmIiI A:B C will bli nk .
67