Nikon SB-25, Инструкция по эксплуатации

Страница: 50 / 73

99 98
FP High-Speed Sync Flash — Flash Photography At Higher Shutter Speeds
Unlike other Nikon SLR models the F90-Series/N90 camera
and the SB-25 allow you to use faster shutter speeds up to
1/4000 sec. for flash synchronization.
Ordinarily the flash fires only when the curtains are fully
opened in regular flash syncs. With FP High-Speed Sync
Flash, the flash consecutively emits light at an extremely
rapid cycle, while the shutter curtains travel to expose the
entire film surface — but the curtains are never fully opened
(i.e. exposure with a “slit”).
By using a high-speed shutter and flash simultaneously,
you can create light flow from a rapidly moving subject.
In outdoor photography, it also enables you to use both a
wider aperture and a faster shutter speed to achieve a shal-
lower depth of field and purposely blur the subject’s back-
ground.
Set Up and Practice
1 Choose position (flash mode selector). Confirm
appears in the LCD panel.
2 Choose position (flash sync mode selec-
tor)*.
* FP High-Speed Sync Flash operation can be performed regardless of the flash
sync mode selector setting; for simplicity, always leave the switch at this posi-
tion.
3 Confirm ISO film speed has been set and appears in
the SB-25’s LCD panel.
ISO speed of film in use is automatically set; if not shown in
the LCD panel, lightly press the camera’s shutter release
button.
4 Confirm the zoom-head position has been set and
appears in the SB-25’s LCD panel.
The zoom-head position is automatically set and indicated
in the SB-25’s LCD panel when the camera is used with an
AF Nikkor lens (including the latest D-Type) or a Nikkor lens
having a built-in CPU.
Or, set manually according to the shooting situation (see
page 29).
DO NOT USE THE WIDE FLASH PANEL (zoom head at the
20mm position). When used,
, and blink in the
LCD panel as an alert.
Chapter
4
1
Flash mode selector
at Manual Flash
2
Flash sync mode
selector at NORMAL
3
ISO
speed of
film in use
5
For select-
ing
and
either or
4
Zoom-head
position
10
Aperture value
Note that a guide number for FP High-Speed Sync Flash
varies with the selected shutter speed and it is smaller than
for regular flash synchronization (i.e. smaller light output).
Furthermore, we recommend you use shutter speeds
between 1/250 and 1/4000 sec. to avoid uneven exposure.
Before proceeding:
✗ ATTACH SPEEDLIGHT TO CAMERA.
✗
TURN ON BOTH SPEEDLIGHT AND CAMERA.
✗
USE MANUAL EXPOSURE MODE.
✗ USE SINGLE-SERVO AUTOFOCUS (S or A) OR MANU-
AL FOCUS (M).
✗
USE SINGLE-FRAME SHOOTING (S) FILM ADVANCE
MODE.
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-601
M
/N6000 FE2
F-401x/N5005 FG
F-601/N6006 FA FG-20
APPLICABLE NIKON SLR MODELS
SB-25_En 03.1.14 8:18 PM Page 98