Nikon D3S - Manual (Page 220)

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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 Available only in exposure modes e and g. In modes f and h, slow sync
becomes front-curtain sync.
2 In exposure modes e and g, flash-sync mode will be set to slow
rear-curtain sync when the M button is released.
3 Y icon blinks if flash unit does not support red-eye reduction.
4 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.
M button Main command
dial
Red-eye reduction with
slow sync 3, 4
Red-eye reduction 3
Front-curtain sync Slow sync 1 Rear-curtain sync 2