Canon Speedlite 470EX-AI Instruction Manual page 59

X AI.B Lamp
Lamp
Off
High-speed
blinking
Lit
Low-speed
blinking
FAQ
When bounce angle automatic correction is not performed even when
the orientation (position) of the camera is changed, underexposure
(insufficient exposure) occurs, or the color of the subject is not right, see
page 53.
Depending on the state of the flash head
during AI.B semi-auto shooting, the
display (lit/blinking) of the blue <X>
lamp changes.
Bounce angle not registered (before AI.B semi-auto
shooting is started)
AI.B semi-auto operation in progress or bounce angle
correction in progress
Bounce angle registration is complete (AI.B semi-auto
shooting possible)
When the bounce angle changes after registration
Error in AI.B semi-auto mode
When the flash head is not in the forward-facing position
(before shooting in AI.B semi-auto mode)
V AI.B Semi-Auto Shooting
Status
59