Nikon D90 - Manual (Page 91)

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Flash Mode
Press the M button and rotate the main command dial until the desired flash mode is
displayed in the control panel.
The current flash mode is displayed in the control panel as shown below.
A Rear-Curtain Sync
Normally the flash fires as the shutter opens (“front-curtain sync”; see below at left). In rear-
curtain sync, the flash fires just before the shutter closes, creating the effect of a stream of light
behind moving subjects.
M button Main command dial Control panel
Y (red-eye reduction): Use for portraits. Red-eye reduction lamp lights
before flash fires, reducing “red-eye.”
j (off): Flash does not fire even when lighting is poor or subject is back-lit.
SLOW (slow sync) : Shutter speed slows automatically to capture background
lighting at night or under low light. Use to include background lighting in
portraits.
REAR (rear-curtain sync) : Flash fires just before shutter closes (see below). If
this icon is not displayed, flash will fire immediately after shutter opens.
AUTO (auto flash) : When lighting is poor or subject is back lit, flash pops up
automatically when shutter-release button is pressed halfway and fires as
required.
Front-curtain sync Rear-curtain sync