32
About
Metering
System
and
Exposure
Metering systems and exposure are important factors for taking
pictures. Knowing the characteristics of each factor helps you
widen your photographic expression .
• Metering System
As the proper combination
of
shutter speed and aperture for correct
exposure is determined according to subject brightness and film
sensitivity, measuring subject brightness
is
very important.
In
general, brightness inside the viewfinder is not uniform. The
NBO
I
NBOQD
provides three metering systems: Matrix Metering, Center-
Weighted Metering and Spot Metering. With Matrix Metering, scene
brightness data is detected by the 10-segment Matrix sensor. With
Center-Weighted Metering, most
of
the meter's sensitivity is
concentrated on the 12mm-diameter center circle
in
the viewfinder. Spot
Metering sensitivity is concentrated
in
a small, selected focus area from
five available focus areas. Using D- or G-type Nikkor lenses, the
NBO
/
NBOQD
camera performs 3D Matrix Metering by adding distance
information to determine correct exposure. See page
4B
.
• Exposure
Light from the subject passes through the lens and exposes the film.
Shutter speed and aperture control how much light reaches the film. The
combination
of
shutter speed and aperture appropriate for subject
brightness and film sensitivity results
in
correct
exposure-a
result
provided by the
NBO
/
NBOQD
's four exposure modes: Auto-Multi
Program (page
50)
, Shutter-Priority Auto (page
52)
, Aperture-Priority
Auto (page
54)
and Manual (page
56)
exposure modes.
When a highly reflective or very low reflective object is within a frame,
correct exposure may not be obtained.
In
such situations, exposure
compensation is required. The
NBO
/
NBOQD
offers auto exposure lock
(page
5B)
, exposure compensation (page
60)
or Auto Exposure
Bracketing function (page
61)
allowing a photographer greater control
of
exposure than that afforded by Auto exposure modes.
)
l.
U M
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