Canon Speedlite 470EX-AI Instruction Manual page 102

Troubleshooting Guide
A warning is displayed.
For warning displays, see page 52.
The flash coverage cannot be set manually.
The flash coverage cannot be manually set in AI.B full-auto
shooting, with the bounce adapter attached, or with wide panel used.
The bounce angle cannot be set manually.
When you want to perform manual bounce flash photography, see
page 61.
Pictures are underexposed.
During bounce flash photography, less light reaches the subject and
thus underexposure (insufficient exposure) is prone to occur. Take
the action such as taking the picture as close to the subject as
possible, increasing the camera's ISO speed, or opening the
aperture of the lens before shooting.
When the ceiling or wall for bouncing the flash light on is too far
away, the ceiling is dark, or the ceiling is stepped or uneven,
shooting with the appropriate exposure may not be possible since
not enough light may reach the subject.
The color of the subject is not right.
If the surface for bouncing the flash light is not white, a color cast
may result in the picture or shooting with the appropriate exposure
may not be possible since the bounced flash light may not reach the
subject. Select a ceiling or wall that is close to a white color for
bouncing the flash light off for high reflectance.
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