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Chapter
4
Rear-Curtain Sync Flash —
For Natural Light Flows
When used with the F90-Series/N90, F4-Series, F-801/
N8008, F-801s/N8008s, F-601/N6006 and F-601
M/N6000,
the SB-25 lets you synchronize the flash to the instant
before the rear (second) curtain begins to close. This turns
available light into a stream of light that follows the moving,
flash-illuminated subject.
Rear-curtain sync flash photography is most effective
with slower shutter speeds. You can slow the shutter down
to 30 sec., depending on the background situation.
Before proceeding:
ATTACH SPEEDLIGHT TO CAMERA.
TURN ON BOTH SPEEDLIGHT AND CAMERA.
USE SHUTTER-PRIORITY AUTO OR MANUAL EXPO-
SURE MODE.
USE SINGLE-SERVO AUTOFOCUS (S or A) OR MANU-
AL FOCUS (M).
Hints and Notes
Select TTL Auto
, Non-TTL Auto or Manual Flash
mode.
Choose position (flash mode selector).
With the F-601/N6006 and F-601M
/N6000, you must
select REAR-CURTAIN SYNC FLASH on the camera. This
sync flash then operates regardless of the SB-25s sync
mode setting, either
or position.
With the F90-Series/N90, although it is possible to select
REAR-CURTAIN SYNC FLASH on the camera, the
SB-25s sync mode setting will override what is set on the
camera.
With the F90-Series/N90, F-601/N6006 and F-601M/
N6000 used in programmed auto or aperture-priority auto
exposure mode, the camera automatically controls the
shutter speed down to as slow as 30 sec.
In the following cases Rear-Curtain Sync Flash cannot be
performed:
1) When using Vari-Program or Red-Eye Reduction
Control with an F90-Series/N90 camera.
2) When performing multiple flash photography with an
F90-Series/N90, F4-Series, F-801/ N8008 or F-801s/
N8008s.
3) When shutter speed dial is set at T with an F4-
Series camera.
Use a tripod to minimize camera shake.
Red-Eye Reduction Control —
For Better Flash Portraits
Light from the cameras flash reflects off the interior of the
eye through the wide-open pupil and back into the cam-
eras lens. The result is a portrait with the subjects eyes
bright red, a phenomenon known as red-eye effect.
When used with the F90-Series/N90 camera, the SB-25
fires three pre-flash consecutively before the main flash to
reduce the appearance of red eyes.
Red-eye effect can also be affected by the angle at which
light flash on the subject and is reflected back to the lens.
For further details on red eye, see page 134.
Before proceeding:
ATTACH SPEEDLIGHT TO CAMERA.
TURN ON BOTH SPEEDLIGHT AND CAMERA.
USE SINGLE-SERVO AUTOFOCUS (S or A) OR MANU-
AL FOCUS (M).
USE SINGLE-FRAME SHOOTING (S) FILM ADVANCE
MODE.
Hints and Notes
Set Red-Eye Reduction Control on the camera.
Confirm appears in the SB-25s LCD panel.
Red-Eye Reduction Control can not be used in Repeating
Flash mode.
Rear-Curtain Sync Flash cannot be performed.
F90-Series/N90
F-501/N2020 Nikonos V
F4-Series F-301/N2000 F3-Series
F-801/N8008 F-401/N4004 F2-Series
F-801s/N8008s F-401s/N4004s FM2
F-601M/N6000 FE2
F-401x/N5005 FG
F-601/N6006 FA FG-20
APPLICABLE NIKON SLR MODELS
F90-Series/N90
F-501/N2020 Nikonos V
F4-Series F-301/N2000 F3-Series
F-801/N8008 F-401/N4004 F2-Series
F-801s/N8008s F-401s/N4004s FM2
F-601M/N6000 FE2
F-401x/N5005 FG
F-601/N6006 FA FG-20
APPLICABLE NIKON SLR MODELS
105
SB-25_En 03.1.14 8:18 PM Page 104
53


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