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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
• 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.
26
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).
03. F073-E (23~) 02.4.1 2:09 PM Page 26