Bedienungsanleitung Nikon SB-25 (Seite 7 von 73) (Englisch)

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FP High-Speed Sync Flash

Chapter

Main Features/Functions

Standard TTL Flash

It is possible to manually select a flash compensation

level instead of having the computer do it automatical-

ly. Simply press the SB-25’s button to cancel

Automatic Balanced Fill-Flash.

The camera’s computer-controlled TTL flash sensor

detects the total amount of light passing through the

lens and reflected from the film surface. The system

controls flash output so that the combination of ambi-

ent light and flash illumination will result in a correct

exposure.

Under bright-light conditions, the flash is automati-

cally controlled to provide less light; under dim light

conditions, it will produce more light.

This system is not designed to automatically provide

a balance between flash and ambient light; it is limited

to efficient operation in dim-light conditions and is not

recommended for use in very bright lighting condi-

tions. This system does not directly link the ambient

light meter and the flash’s TTL meter.

FP High-Speed Sync Flash: Allows a wider aperture, thus, shallower

depth of field for a blurred background.

“TTL Multi-Sensor” Automatic Balanced Fill-

Flash with F90-Series/N90

After you depress the shutter release button and prior to the

shutter being activated, the SB-25 fires a series of nearly

invisible preflash, or Monitor Preflash.

These preflash are detected by the F90-Series/N90’s TTL

multi-sensor, analyzed for brightness and contrast, then

integrated with distance information from the lens (D-type

Nikkor) and other exposure control information for a bal-

anced fill-flash exposure.

3D Multi-Sensor Balanced Fill-Flash can be performed

with any built-in metering system, and is most effectively

used to achieve correct exposure in scenes that include:

• A mirror, white wall or other surface with extremely high

reflectivity

• Obstacle(s) in front of subject you wish to avoid

• Sunlight

• Subject against an “infinite” background (empty sky,

clouds, etc.)

With non-D-type AF or AI-P Nikkor lenses, Multi-Sensor

Balanced Fill-Flash will be performed. Although the TTL

multi-sensor does not process distance information, the

advanced sensor system generally provides superior results

to Matrix Balanced Fill-Flash.

3D Multi-Sensor Balanced Fill-Flash photography: particularly

effective for subject standing against a shiny object.

The SB-25 is capable of flash synchronization at shutter

speeds of 1/250 sec. or faster when used with the new F90-

Series/N90. Unlike other flash synchronization methods, the

flash consecutively emits light at an extremely rapid cycle

and exposure begins with the opening of the front (first) cur-

tain and ends with the closing of the rear (second) curtain.

SB-25_En 03.1.14 8:18 PM Page 12

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