Sony HVL-F43M Operating Instructions Manual page 20

About flash mode
• (Fill-flash mode)
The flash unit always fires.
• AUTO (Auto flash mode)
The flash unit is set to this mode when the camera is set to auto flash.
• WL (Wireless flash mode)
This mode is used during wireless flash photography.
• (Un-fill-flash mode)
The flash unit does not fire.
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