Nikon N70 AF Instruction Manual page 73

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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. Ultimately, 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 rule of
thumb,
when shooting a
landscape,
the
light meter reading
from green
grass is
roughly equivalent
to 18%
reflectance.
73

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