Panasonic Lumix G100 Mirrorless Camera with 12-32mm Lens - Manual (Page 228)

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9. Flash
• The flash fires twice.
The interval between the first and second firings is longer when [ ] or
[ ] is set. The subject should not move until the second firing has
finished.
• [ ] and [ ] cannot be used when the following are set:
– [Flash Synchro]: [2ND]
– [Wireless]: [ON]
• Some flash modes may not be available depending on the settings on the
external flash.
• The effectiveness of red-eye reduction varies from person to person.
The effect, which is influenced by factors such as distance to the subject
and whether the subject is looking at the camera when the preliminary flash
is fired, may not be very noticeable in some cases.