Canon Speedlite 550EX Instructions Manual page 81

Using Flash In Other Camera Modes
(1) Av: Aperture-Priority AE and TIL Autoflash
This mode is effective for controlling the depth of field in your flash pictures.
You can also obtain a balanced expo sure between the subject and
background. You set the aperture and the camera sets the shutter speed
automatically to obtain a correct exposure for the background. The TTL
autoflash system obtains the proper exposure based on the aperture you sel.
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1.I1.11U 2 J . I l n 11 ..
50 55
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•
1
Sellhe camera's picture-taking mode
to Av.
2
Set the 550EX's flash mode to
TTL.
3
Focus the subject.
4
Check that the subject distance is
within the flash range displayed on
the 550EX's LCD panel.
5
Check that the l icon is displayed in
the viewfinder, then take the picture.
~
K lhe
lop
S)'!'Ie sp!MId
dispIa~
blinks,
the badlground wIll be OYefexposed.
And
il tlle
30"
tlJ
shu!!81 speed
displa~
blinils, Ihe background will
be
Und8l8Xposed. In such cases,
chanpe
tile
aperture until the
shtlllElf
sp!MId
display slopS
blinking.
81