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The film indexes for
color
films, assigned by the
manufacturer, can be used with meters marked
for ASA Indexes. Howevel", it
may
be desirable to
modify this index to get the result you want for
the condition under which
you
will use the picture.
For example,
a
transparency
projected
with a
high-wattage projector on a small screen requires
less
exposure than when
shown
with a
low-watt-
age projector on a
large
screen.
If
you have taken pictures before, be guided by
past experience. Note the reading provided by the
meter and, if necessary,
adjust
the index.
With color film it may be worth while to take a
few pictures of a typical
sunlit
outdoor subject,
with the sun in back of you, for test purposes.
One
picture should be at the
setting
indicated by
the
exposure meter
and
the
others
one exposure-value
number more and one exposure value
less.
From
the results, when projected, you can tell readily
whether you
should
use the
setting
suggested
by
the film
manufacturer or a higher or a lower one.
Another
approach to getting the kind of pictures
37
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