Nikon Z 6II Reference Manual page 662

Option
[Slow sync]
L
(Slow sync)
[Slow sync +
red-eye]
K
(red-eye
reduction with
slow sync)
[Rear-curtain
M
sync]
s
[Flash off]
Flash Modes
620
Description
As for "fill flash", except that shutter
speed slows automatically to
capture background lighting at
night or under low light.
•
Note that photos may be prone
to blurring due to camera shake
at slow shutter speeds.
•
Use of a tripod is recommended.
Use to include background lighting
in portraits. Red-eye reduction is
combined with slow shutter speeds
to capture background lighting at
night or under low light.
•
Note that photos may be prone
to blurring due to camera shake
at slow shutter speeds.
•
Use of a tripod is recommended.
The flash fires just before the
shutter closes, creating the effect of
a stream of light behind moving
light sources.
•
Selecting P or A after choosing
this option sets the flash mode to
slow sync.
•
Note that photos may be prone
to blurring due to camera shake
at slow shutter speeds.
•
Use of a tripod is recommended.
The flash does not fire.
Available
in
P, A
P, A
P, S, A, M
b , P, S, A,
M