Canon Speedlite 470EX-AI Instruction Manual page 55

General Cautions for AI.B full-auto Shooting
When the <X> is switched to another mode or when the power switch
is set to <J>, the bounce angle stored (registered) in the Speedlite is
cleared.
When using the FE lock or self-timer, double-click the shutter button, and
once the flash head is reset (automatic correction) to the stored
(registered) position, perform the FE lock operation or shooting.
When a picture is taken with the camera oriented downward or upward,
the appropriate bounce angle may not be automatically set. If this
happens, take the picture using the following technique.
• Perform AI.B semi-auto shooting (p.56)
• Set the <X> switch to the <0°> position so that the flash head is
facing forward (p.42).
• Manual bounce flash photography (p.61)
When the <X> button is pressed during movie shooting, although
AI.B full-auto distance measurement operation (preflash) is performed,
flash photography cannot be performed.
When you turn the flash head, turn it slowly. While it may make a sound
when you turn the flash head, it is not a malfunction. However, it may
result in a mechanical failure if you continuously turn the flash head fast.
During AI.B full-auto shooting, you can fire the flash at the desired bounce
angle as in manual bounce flash photography by pressing the <z>
button after determining the orientation (position) of the camera and
adjusting the flash head.
W AI.B Full-Auto Shooting
55