Instruction Manual

2. Using Flash in Other Camera Modes

Flash photography is also automatic in the other picture-taking modes. In the

Av (aperture-priority AE), Tv (shutter speed-priority AE), and M modes, the

E-TTL autoflash system sets the flash exposure automatically. The camera

sets the necessary shutter speed (in the Av mode), aperture (in the Tv mode),

or flash output (in the M mode). Flash photography is as easy as normal AE

picture-taking.

Shutter Speed and Aperture Settings for Picture-Taking Modes

Camera Mode

Shutter Speed Flash Aperture

Automatically set (30 sec. - 1/X sec.)

Manually set

Tv Manually set (30 sec. ■ 1/X sec.) Automatically set

M Manually set (bulb. 30 sec. - 1/X sec.) Manually set

Manually set: You set it yourself.

Automatically set: Set automatically by the camera.

1/X sec.: Maximum sync speed, (see page 124)

When the shutter button is pressed completely, a prellash tires to obtain an evatuative flash

meter reading for setting the optimum output of the main tiash.

The background's exposure is set with the shutter speed and aperture combination.

[^ • If the camera is set to the O mode (Full Auto), the shutter speed and aperture will be

lliJ set in the same way as in the P mode (Program AE).

• It the DEP mode (depth-of-field AE) is used with the 550EX, it will be the same as

using the P mode (Program AE).