Canon SPEEDLITE EL-1 Advanced User's Manual page 68

2.
Set the flash coverage.
Push the joystick up / down / left / right or turn <
coverage, then push the joystick vertically.
Select <
focal length mm) for manual setting.
Note
When you set the flash coverage manually, set the same or a wider coverage than
the angle of view for shooting to avoid darkening the periphery of the picture.
When a lens with a focal length of less than 24 mm is attached, the <
warning is displayed on the LCD panel. When using a camera with the image
sensor size smaller than full-frame, the <
actual shooting angle of view is wider than the angle of view of a 24 mm lens.
When shooting with the sync terminals of the camera and the Speedlite connected
by a commercially-available sync cord, set the flash coverage manually.
> for automatic setting, or select a value (indicating the
68
> to select the flash
> warning is displayed when the
>