Nikon D750 DSLR Camera (Body Only) - Manual (Page 211)

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Flash Modes
The following flash modes are available:
Fill flash : The flash fires with every shot.
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.
Red-eye reduction with slow sync : 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 .
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 .
Slow rear-curtain 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 . S is displayed when
setting is complete.
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 .
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Off : The flash does not fire. Not available in 0 mode.
Front-curtain sync Rear-curtain sync