Canon 550 EX - Manual (Page 80)

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
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
• 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, the flash fires and the picture is taken. The flash
output is controlled by the TTL autoflash system based on the aperture set by you or the camera.
The TTL autoflash system meters the light reflected off the film during the exposure and cuts off
the flash when the proper exposure is obtained.
• The background’s exposure is set with the shutter speed and aperture combination.
80
Camera Mode Shutter Speed Flash Aperture
Av 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
• 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 P mode (Program AE).
• If the DEP mode (depth-of-field AE) is used with the 550EX, it will be the same as
using the P mode (Program AE).
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