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Chapter
1
Main Features/Functions
Rear-Curtain Sync Flash
The combination of high shutter-speed range and flash
sync capability provides you with more options for flash
photography in day-light conditions. It enables you to use a
wider aperture to blur the subjects background (create a
shallow depth of field), light up shadowed areas in outdoor
photography, or even create light flow for fast moving sub-
jects.
FP high-speed sync flash is only available in the SB-25s
Manual flash mode when using the F90-Series/N90. For
details, see FP High-Speed Sync Flash Flash
Photography At Higher Shutter Speeds on page 98.
X: Time duration
Y: Shutter curtain movement
: Front-curtain movement
: Rear-curtain movement
1: Film surface is exposed to
flash light throughout the
entire duration.
2: Film surface is exposed to
flash light for only part of
the time that the curtain
are open.
FP High-Speed
Sync Flash
Front-curtain sync flash Rear-curtain sync flash
SB-25 sync flash
In normal flash synchronization, the flash fires at an early
stage of exposure (i.e., front-curtain sync). At slow shutter
speeds with a moving subject, this results in unnatural light
patterns.
For more natural lighting, use Rear-Curtain Sync. With
this method, the flash fires at a later stage of the exposure,
just before the rear, or second, shutter curtain starts to
close (i.e., rear-curtain sync), turning available light into a
stream of light that follows the flash-illuminated moving
subject. Rear-Curtain Sync is available with the F90-
Series/N90, F4-Series, F-801/N8008, F-801s/N8008s,
F-601/N6006 and F-601
M/ N6000.
For more details, see Rear-Curtain Sync Flash For
Natural Light Flow, page 105 and Flash Sync Mode
Selector
vs. , page 135.
A slow shutter speed could create light flow from a moving subject.
Rear-Curtain Sync Flash catches him/her with natural-looking light
stream.
Light output
SB-25_En 03.1.14 8:18 PM Page 14
8


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