Panasonic DMC-FZ70K - Manual (Page 152)

Application (Record)
Using the [Rec] menu
VQT5B76
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•For the setting procedures of the menu. (→57)
[Flash Synchro]
You can set the timing for firing the flash depending on the picture that you want to create.
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Settings: [1ST] / [2ND]
Flash firing timing chart
[1ST] is set
Elapsed time
[2ND] is set
The picture is taken (shutter is open).
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Normally, set to [1ST].
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If you set to [2ND], [2nd] will be displayed in the flash icon on the screen.
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When a fast shutter speed is set, the Flash Synchro effect may not be sufficiently
achieved.
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[Flash Synchro] can be used even when you use an external flash.