Nikon D4 - Manual (Page 226)

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❚❚Choosing a Flash Mode
To choose the flash mode, press
the
M button and rotate the main
command dial until the desired
flash mode is selected in the top
control panel:
1 Y icon flashes if flash unit does not support red-eye reduction.
2 Red-eye reduction with slow sync is available only in exposure modes e
and g. In modes f and h, red-eye reduction with slow sync becomes
red-eye reduction.
3 Available only in exposure modes e and g. In modes f and h, slow sync
becomes front-curtain sync.
4 In exposure modes e and g, flash-sync mode will be set to slow
rear-curtain sync when the M button is released.
M button Main command
dial
Rear-curtain sync 4 Slow sync 3
Front-curtain sync Red-eye reduction 1
Red-eye reduction with
slow sync 1, 2