Aperture value film speed (iso number), Vi. other information – Canon EOS 5000 User Manual
Page 49
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VI. OTHER INFORMATION
Aperture Value
Film Speed (ISO Number)
Integrated in the lens, the aperture is
an opening which can be widened and
narrowed to adjust the amount of light
reaching
the
film.
The
size
of
the
opening
is
called
the
aperture
value.
The
camera-displays
the
aperture
value on the LCD panel in a range
from 1.0 to 32, although this rpay vary
depending on the lens used.
The
larger
the
aperture
value,
the
smaller
the
diameter
of
the
aperture
when
the
photograph
is
taken,
resulting in less light reaching the film.
The film speed is a value indicating
the
level
of
the
film’s
sensitivity
to
light, as set by the ISO (International
Standardization
Organization).
The
camera
can
use
film
with
an
ISO
number in a range from 25-5000.
The
higher
the
ISO
number,
the
higher
the
film’s
sensitivity
to
light.
The higher the film speed, the lower
the
lighting
level
required
for
photography.
With
high-speed
film,
pictures can be taken under low-light
conditions.
Film
should
be
selected
according
to
your
photographic
objectives.
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