Sealife DIGITAL FLASH - Manual (Page 16)

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Pre-flash cancellation settings:
The Pre-Flash cancellation switch setting matches the number of pre-
flashes of your camera:
Switch position Description of setting
0 Instant synchronization mode.
For cameras with No pre-flash.
Use “0” setting for all SeaLife cameras an
other brands that allow you to disable the
camera’s pre-flash.
1 One pre-flash
2 Two pre-flashes
3 Three pre-flashes
4 Four pre-flashes