Using The Wide Panel - Canon SPEEDLITE 580EX II Manual De Instrucciones

H: Setting the Flash Coverage and Using the Wide Panel
The flash coverage can be set to match the lens focal length from
24mm to 105mm. The flash coverage can be set automatically or
manually. Also, with the built-in wide panel, the flash coverage can be
expanded for 14mm wide-angle lenses.
If you set the flash coverage manually, make sure it covers the lens focal
length so that the picture will not have a dark periphery.
If you use a commercially-available sync cord to connect the camera to
the Speedlite's PC terminal, set the flash zoom manually.

Using the Wide Panel

The flash coverage will not be compatible with the EF15mm f/2.8 Fisheye
lens.
If you use bounce flash with the wide panel in place, the entire display on
the LCD panel will blink as a warning. Since the subject will be
illuminated by both the bounce flash and direct flash, it will look
unnatural.
Pull out the wide panel gently. Using excessive force may detach the
wide panel.
20
Press the <G> button.
Turn the <9> dial to change the
flash coverage.
If <d> is not displayed, the flash
coverage will be set automatically.
Pull out the wide panel and place it over
the flash head as shown. The flash
coverage will then be extended for
14mm.
The catchlight panel will come out at
the same time. Push the catchlight
panel back in.
The <G> button will not
work.