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EXPOSURE
METERING
SYSTEM
The Nikon N90 has three type
of
exposure metering
systems-
Matrix Metering,
Center-Weighted Metering and Spot Metering.
MATRIX METERING
This system
is
ideal for quick operation
in
any exposure mode
(pp. 49-66). With D-type
AF
Nikkor lenses including AF-I Nikkor,
3D Matrix Metering
is
automatically activated. 3D Matrix
Metering uses three types
of
data:
(1)
scene brightness,
(2)
scene contrast and
(3)
focused subject's distance (Distance
Information). Data on scene brightness and contrast are
detected by the camera's 8-segment Advanced Matrix Sensor,
while data on the focused subject's distance
is
detected and
relayed by the D-type AF Nikkor lens
in
use.
In
addition, the
information sent by the camera's autofocus system indicating
whether the main subject
is
centered
is
also considered
in
the
computation. By analyzing these data, the N90's built-in
microcomputer
is
able to provide correct exposure even
in
extremely complex lighting situations.
30
If a non-D-type lens
is
used, Advanced Matr
ix
Metering
is
performed. Although lens' Distance Information
is
not given, 8-
segment Matrix sensor provides the correct exposure
in
most
lighting situations.
Note that Matrix Metering system can be used only with lenses
that have a built-in CPU (such as
AF
Nikkor and AI-P lenses.)