Using flash in other camera modes – Canon 550EX User Manual

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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

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

Automatically set

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 preflash fires to obtain an evaluative flash

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

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

- If the camera is set to the □ mode (Full Auto), the shutter speed and aperture will be

set in the same way as in the

mode (Program AE).

• If the

DEP

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

using the

mode (Program AE).