22
5.
Clo
sed Aperture Light Measuring
-----------------------------
In
ordinary situations, the open aperture
light reading
is
more convenient
as
it enables
bright viewing
of
the subject area and also
effectively provides against inaccuracy
of
light
measurement resulting from strong backlight
entering through the viewfinder eyepiece.
Nevertheless, closed aperture light reading
is
necessary in photomicrography or when using
lenses
of
undeterminable f-number.
The
method
of
closed aperture
li
ght
reading
IS identical
with
any type
of
lens used.
1.
Adjust both the lens selector dial and
diaphragm setting lever
of
the camera to
f/
104-
2.
Stop down the lens to the required aperture
and match the needl
es
by turning the shutter
speed dial.
3.
Take every precaution against backl ight
entering from the viewfinder eyepiece.
Because the light transmitted through the
lens in case
of
closed aperture light reading
is
often weaker than the backlight, error
in exposure reading
is
liable to occur.
To
prevent errors in light reading, therefore,
the use
of
the eyecup
is
recommended.
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