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Glossary
CPU
Central Processing Unit. The electronic component that controls
an
electronic product's
functions.
AF Nikkor (including G- and D-type
AF
Nikkor) and AI-P-Nikkor lenses have built-in
CPUs.
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 I
SO
.
At ISO 100, the combination of a one-second shutter speed and
an
aperture of
f11.4
is
defined
as
EV1
.
The camera can be used only within the
EV
range of the exposure meter. For exampl
e,
with the N55, the exposure metering range is from
EV1
to
EV20
at I
SO
100 with
an
f/1.4
lens.
Exposure bracketing
Shooting the same subject a number of times at a range of different exposures to attain
proper exposure. Three shots with metered
EV
, under
EV
, and over EV exposure
are
performed
in
that order with the N55.
Automatic exposure bracketing is performed with varied shutter speeds and/or
apertures.
Exposure Compensation
In a situation such
as
when your subject is strongly backlit, exposure compensation
enables you to intentionally compensate the standard exposure value measured by the
camera
to
create a desired effect. Exposure compensation of
-2
EV
to
+2
EV
in
1/2
steps is available with the N55.
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