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EXPOSURE
COMPENSATION
Exposure compensation is a photographic technique that
enables you
to
vary the final exposure settings from those
measured by the camera's light meter. Nikon's 3D Matrix
Metering employs methods
of
exposure calculation that
automatically apply exposure compensation, depending upon
scene brightness and contrast, and distance information. As a
result, your subject, whether it
is
centered
in
the viewfinder
or
not,
is
given corrected exposure
in
most
lighting situations.
We
do
not recommend using any manually
or
automatically
applied exposure compensation when using Matrix Metering.
If
you identify an extreme condition under which Matrix may have
some difficulty, such as a severely backlit scene
or
one with
extremes
of
contrast, we recommend using your camera's
other built-in meters, Center-Weighted
or
Spot. Ultimatel
y,
only
you
know
what
the subject
or
a part of it requires
in
terms of
exposure measurement. That's why the N70 camera
incorporates three meters plus a variety
of
exposure
compensation systems. The photographer's creativity
is
always
the final deciding and controlling factor. To use the various
exposure compensation functions, please refer
to
the following.
•
USing
auto exposure lock function with AE-L button (pages
74 to 75)
• To obtain meter reading for a particular subject
in
Manual
exposure
mode
(pages 76
to
77)
• Modifying exposure control
by
exposure compensation
function (pages 78
to
79)
•
All
Mode
Exposure Bracketing (pages
80
to
81)
Results will vary, depending on conditions, so you will want
to
experiment with each method.
About reflectance
When using the Center-Weighted
or
Spot Meter, always
keep
in
mind that the exposure indicated will assume that
the subject's reflectance
is
equivalent
to
18%.
If
the
subject varies from this reflectance, you must make
an
adjustment
to
exposure. Generally speaking, a white
subject will have about a
90
% reflectance, and
an
adjustment
of
2.5 f/stops (further open) will bring the
exposure
back
to
the equivalent of
an
18% reading. As
another
ru
le of thumb, when shooting a landscape, the
light meter reading from green grass
is
roughly equivalent
to
18% reflectance.
73