Canon SPEEDLITE EL-1 Advanced User's Manual page 69

Wide Panel
When you use the flash's built-in wide panel, you can perform flash photography covering
the angle of view of an ultra-wide angle lens with focal length as wide as 14 mm.
1.
Pull out the wide panel.
2.
Push back the catchlight panel.
Caution
Since underexposure may occur, the <
panel when using the wide panel with bounce flash.
Do not pull out the wide panel with excessive force. Doing so may detach the wide
panel from the Speedlite.
Angle of view of EF15mm f/2.8 Fisheye or EF8-15mm f/4L Fisheye USM is not
supported.
Pull out the protruding area located in the center of the wide panel.
The white catchlight panel is pulled out at the same time.
Push back the catchlight panel only, keeping the wide panel down.
> warning is displayed on the LCD
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