Panasonic Lumix G100 Mirrorless Camera with 12-32mm Lens - Manual (Page 232)

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9. Flash
[Flash Synchro]
When a moving subject is recorded at night using a slow shutter and flash,
a trail of light may appear in front of the subject.
If you set [Flash Synchro] to [2ND], you can take a dynamic picture with
a trail of light appearing behind the subject by firing the flash immediately
before the shutter closes.
[ ] [Flash] Select [Flash
Synchro]
[1ST]
This is the normal method for recording
with the Flash.
[2ND]
The light source appears behind the
subject and the picture becomes
dynamic.
• When [2ND] is set, [2nd] is displayed on the flash icon of the recording
screen.
• When the following functions are being used, [Flash Synchro] is fixed to
[1ST]:
– [Wireless]
– [Live View Composite]
• The effect may not be adequately achieved at faster shutter speeds.