Using flash in other camera modes – Canon 550EX User Manual
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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.
2. Using Flash in Other Camera Modes
Shutter Speed and Aperture Settings for Picture-Taking Modes
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
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.
0
" 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).
• 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).
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