Nikon N1538 Reference Manual page 132

❚❚ Flash Modes
The following flash modes are available:
• N (fill flash): The flash fires with every shot.
• Nj (red-eye reduction): Use for portraits. The flash fires with
every shot, but before it fires, the red-eye reduction lamp
lights to help reduce "red-eye. " Not available in 0 mode.
• Njp (slow sync + red-eye): As for "red-eye reduction",
above, except that shutter speed slows automatically to
capture background lighting at night or under low light. Use
when you want to include background lighting in portraits.
Not available in modes S, M, and 0.
• Np (slow sync): As for "fill flash", above, except that
shutter speed slows automatically to capture background
lighting at night or under low light. Use when you want to
capture both subject and background. Not available in
modes S, M, and 0.
• Nt (rear-curtain + slow sync): As for "rear-curtain sync",
below, except that shutter speed slows automatically to
capture background lighting at night or under low light. Use
when you want to capture both subject and background. Not
available in modes S, M, and 0.
• Nq (rear-curtain sync): The flash fires just before the
shutter closes, creating a stream of light behind moving light
sources as shown below at right. Not available in modes P, A,
and 0.
Front-curtain sync
104 More on Photography
Rear-curtain sync