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GLOSSARY
Balanced fill-flash operation
A technique in
flash
photography in which flash illumination is
controlled
to
balance it with
the
ambient light on the scene.
The
N90 uses
an
Automatic Balanced Fill-Flash
System with
TIL
Multi-Senosr
for
this automatic operation with a compatible
Nikon TIL
Speedlight.
Continuous Servo AF
Focus
detection continues for as
long
as
the
shutter
release
button
is lightly
pressed and
the reflex mirror is in the
viewing
position.
Useful
when camera-to-subject distance is likely to
change.
CPU
Central
Processing
Unit.
The
electronic component which
controls an electronic
product's functions.
AF
Nikkor
(including
AF-D Nikkor)
and
AI -P-Nikkor
lenses
have
built-in CPUs.
Depth of field
The
zone of sharpest focus in front
of,
behind and around
the
subject on which the lens is
focused;
can be previewed
in the
N90
and some other
Nikon
cameras
D-type AF Nikkor lenses
AF
Nikkor
lenses
that
send
to the
N90's microcomputer the
Distance
Information
used for 3D
Matrix Metering
or 3D
Multi-
Sensor Balanced Fill-Flash (with
Nikon
SB-25 Speedlight).
DX code
Film
information code printed on film cartridge. The
N90,
when
set
to
automatic
film
speed setting
mode,
senses
the film
speed (ISO 25
to
5000) of OX-coded
film when
it
is
loaded.
EV
Exposure Value: A number representing
the available
combinations of shutter speeds and apertures that give the
same exposure
effect under
conditions of similar scene
brightness and ISO.
At ISO 100,
the combination of a one-second shutter speed
and an aperture of f/1
.4 is defined
as
EV1
.
The
camera
may
be
used
only within the EV range of the
exposure meter.
For
example,
with the
N90,
the exposure
metering range is from EV
-1
to EV21
for
Matrix
metering and
Center-Weighted metering,
at ISO
100
with an 1/1.4
lens.
Exposure compensation
Exposure
compensation for available light is activated by
changing shutter speed and/or
lens
aperture- by
Auto
exposure
lock lever,
by exposure compensation
button
or by
exposure bracketing.
In fiash
photography with a
Nikon-dedicated TIL
Speed
light,
exposure compensation can also
be
performed by varying
the
amount of fiash output.
Camera-originated exposure compensation affects both
foreground subject and background; variations in flash output
amount only affect foreground
.
139
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