Canon 550EX manual Av Aperture-Priority AE and E-TTL Autoflash, Using Flash in Other Camera Modes

Using Flash in Other Camera Modes

(1) Av: Aperture-Priority AE and E-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 E-TTL autoflash system obtains the proper exposure based on the aperture you set.

1 Set the camera’s picture-taking mode to Av.

2 Set the 550EX’s flash mode to

.

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 icon is displayed in the viewfinder, then take the picture.

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.

27