Bedienungsanleitung Nikon SB-25 (Seite 50 von 73) (Englisch)

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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

Choose position (flash mode selector). Confirm

appears in the LCD panel.

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.

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.

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

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

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-601M/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

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