Modeling Flash - Canon SPEEDLIGHT 550EX Instructions Manual

10. Modeling Flash

When the 550EX is used with the EOS-1D, 1V, 3, D60, D30, ELAN 7/7E, and
30/33, a modeling flash can be fired so you can check the lighting and
shadow effects before you take the picture.
Custom Function CF-6 can disable the modeling flash and prevent it from firing. See
CF
page 113.
To prevent overheating and deterioration of the flash head, do not fire the modeling flash
more than 10 times in succession. After 10 times, allow the 550EX to cool for at least 10
minutes.
50
Set the desired flash photography
settings with the camera and 550EX.
Press the camera's depth-of-field
preview button.
• The aperture will stop down.
• The 550EX will fire a series of flashes at 70
Hz for 1 sec.