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GLOSSARY------------------------~
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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
's
viewing area.
CPU
Central Processing Unit: the electronic component which
controls equipment functions.
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.
96
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.
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's shutter. 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.