Av: Aperture-Priority Ae And E-Ttl Autoflash - Canon SPEEDLIGHT 550EX Instructions Manual

(1) Av: Aperture-Priority AE and TTL Autoflash
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.
If 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.
Using Flash in Other Camera Modes
Set the camera's picture-taking mode
1
to Av.
Set the 550EX's flash mode to
2
.
Focus the subject.
3
4 Check that the subject distance is
within the flash range displayed on
the 550EX's LCD panel.
Check that the
5
the viewfinder, then take the picture.
icon is displayed in
81