The very definition of the translated Greek word "photography"
means "drawing with light." Whether it is portraits, landscapes,
architecture or just snapshots of the kids, the exposure required
to capture a clear picture will depend on the light reflecting from
the scene, and the overall brightness of the subject. Most of the
time, the amount of available light is out of your control. But, as
the photographer, you do determine how much of that light passes
through the lens of your camera -- and for how long. There are always
three factors involved in making your decision: An ISO (International Standards Organization) number denotes the sensitivity
of a particular film to light. Most people call it the film speed.
The higher the number, the more sensitive the film. An ISO 25 film
requires considerably more light to form a correct exposure than an
ISO 1600 film (64 times more, to be precise).
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