Nikon SB-24 Balanced fill-flash operation, Center-Weighted Metering, Fill-flash, Guide number

GLOSSARY------------------------~~~~~~~~

Balanced fill-flash operation

A method of flash photography which combines flash illumina- tion and ambient light, and keeps flash brightness in balance with the ambient light.

Center-Weighted Metering

An SLR light meter, orginated by Nikon, which concentrates its sensitivity on the center portion of the camera'sviewing area.

CPU

Central Processing Unit: the electronic component which controls equipment functions.

Exposure control for available light

·Programmed: the automatic exposure system controlling both the camera's shutter and the lens'aperture.

Shutter priority: user selects shutter speed and automatic system chooses aperture for correct exposure.

Aperture priority: user selects aperture and automatic system chooses shutter speed for correct exposure.

Manual: user follows the meter's recommendations for shutter and aperture settings.

Exposure compensation

For flash: exposure compensation refers to an adjustment, either automatically or manually set, that enables the user to vary the flash output from standard TTL operation.

For available light: exposure compensation refers to any adjustment of either shutter or aperture which results in an exposure change from the normal measured exposure settings.

Fill-flash

A method of flash photography which combines flash illumina- tion and ambient light, but does not necessarily attempt to balance the two types of illumination .

Flash synchronization

The timing of the flash so it fires coincident with the operation of the camera'sshutter. There are two types of synchronization : NORMAL, which fires the flash at the start of the exposure, and REAR synchronization, which fires the flash at the end of the exposure.

Guide number

A calculated number which indicates the relative power of a flash unit.

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