Canon Speedlite 550EX Instructions Manual page 50

50
10. Modeling Flash
When the 550EX is used with the EOS-3, a modeling flash can be fired so
you can check the lighting and shadow effects before you take the picture.
Set the desired flash photography
settings with the camera and 550EX.
Press the camera's depth-ol-field
preview button.
The aperture will stop down.
The 550EX wil l fire a series of flashes at 70
Hz for 1 sec.
Custom Function
eF·S
can disable
the
modeling flash arid prevent
it
from firing. See
page 113.
To prevenl overheating and deterioration of the Hash head, do not fire the modeling flash
more than 10
~mes
in succession. After 10 times, allow the 550EX to cool for at leiSllO
minutes.