1) av: aperture-priority ae and ttl autofiash – Canon 550EX User Manual
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Using Flash in Other Camera Modes
(1) Av: Aperture-Priority AE and TTL Autofiash
This mode is effective for controlling the depth of field in your flash pictures.
You can also obtain a balanced exposure 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 set.
O.S D.T i 2 a 4 6 9
16
H Set the camera’s picture-taking mode
* to Av.
2
Set the 550EX’s flash mode to
T T L .
2 Focus the subject.
A
Check that the subject distance is
^ within the flash range displayed on
the SSOEX’s LCD panel.
C Check that the i icon is displayed in
^ the viewfinder, then take the picture.
0
lf the top sync speed display blinks, the background will be overexposed. And if the 30”
shutter speed display blinks, the background will be underexposed. In such cases,
change the aperture until the shutter speed display stops blinking.
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