Canon 550EX - Manual (Page 24)

1. Using Flash in Full Auto Mode
Set the camera’s picture-taking mode to P (Program AE) or □ (Full Auto).
Flash photography will then be as easy as normal AE photography. The
camera sets the aperture and shutter speed automatically to suit a wide
variety of lighting conditions including outdoor fill flash. The E-TTL autoflash
system sets the flash exposure automatically.
H Set the camera’s picture-taking mode
' toP.
ETTL Zoom
Cn
jumm
05 07 1.5 2 3 4 6 9 13 18 m
1 OJi 0.7 1 1.5 2 3 4 6 e 13 10 m
O Set the 550EX’s flash mode to
^ ETTL
0 Focus the subject.
• The shutter speed and aperture will be
displayed in the viewfinder.
• The shutter speed will be set automatically at
1/60 sec. or faster (up to the top sync
speed) The aperture is also set at the same
time
A Check that the subject is within the
^ flash range displayed on the 550EX’s
LCD panel.
V SO 5.5
Check that the i Icon is displayed in
the viewfinder, then take the picture.
• A preflash is fired immediately before shutter
release and the main flash The subject's
meter reading is obtained with the preflash
and used to set the output of the main flash.
An optimum flash exposure is thereby
obtained
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