Nikon D780 Reference Manual page 148

Option
[Fill flash]
I
(front-curtain
sync)
[Red-eye
reduction]
J
(red-eye
reduction)
[Slow sync]
L
(slow sync)
[Slow sync +
red-eye] (red-
K
eye reduction
with slow sync)
[Rear-curtain
M
sync] (rear-
curtain sync)
s
[Flash off]
102 Camera Controls
Description
This mode is recommended for
most situations.
The flash fires before the
photograph is taken, reducing "red-
eye".
As for "fill flash", except that slow
shutter speeds are used to capture
background lighting at night or
under low light.
As for "red-eye reduction", except
that slow shutter speeds are used to
capture background lighting at
night or under low light.
The flash fires just before the shutter
closes.
The flash does not fire.
Shooting
mode
b , P, S, A,
M, EFCT
( j and m
excluded)
b , P, S, A,
M, EFCT
( j and m
excluded)
P, A
P, A
P, S, A, M
b , P, S, A,
M, EFCT