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slightly
lower film
speed
results in
slightly
lighter
transparencies, preferred by
some
people
,
using
a
low-wattage projector or
a
large
screen .
• The field covered
by the exposure control cor-
responds
approximately
to the field covered by the
50mm
lens. When using the control to determine
exposure for wide-angle
or telephoto
shots,
make
appropriate compensation
for excessive differences
in brightness between the field covered by the con-
trol
and
the field
covered
by these
lenses.
INCIDENT
LIGHT
READINGS
In
some
instances it is
advisable
to measure the
light
falling on
the
subject.
Press the
white
plastic
incident light mask, packed
with
the
camera,
over
the photocell,
with
the pins of the mask in the locat-
ing
holes
of
the photocell; then point the camera
from
the
subject
to the position
from which
the
picture
will
be made. Set exposure
as
usual.
This method is useful
for
floodlighted pictures,
snow scenes, and
pictures
against
the light.
When
the subject
is inaccessible, readings can be
taken
from a substitute
position, illuminated
simi-
larly to the
subject.
27
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