Film

Initially, moving pictures meant only the movement that is perceived when a
string of celluloid-recorded images are projected at a rate of about 16 or
more frames per second (see persistence of vision). Today, motion pictures
(or "movies") are an art form, as well as one of the most popular forms of
entertainment.

A feature film is usually defined as being more than 60 minutes in length.

Opportunities to see a feature film include:

   * going to a movie theater
   * watching it on television
   * renting or buying a video tape or DVD
   * downloading one from the internet and watching it on the computer display

History of cinema

Originally moving picture film was shot at various speeds using hand-cranked
cameras; then the speed for mechanized cameras and projectors was
standardized at 16 frames per second, which was faster than much existing
hand-cranked footage. A new standard speed, 24 frames per second, came with
the introduction of sound. Improvements since the late 1800s include the
mechanization of cameras, allowing them to record at a consistent speed, the
invention of more sophisticated filmstocks and lenses, allowing directors to
film in increasingly dim conditions, and the development of synch sound,
allowing sound to be recorded at exactly the same speed as its corresponding
video. Since the advent of many other media technologies, film may include a
broad range of media — both linear and non-linear, dramatic and
informational, motion and still (though progressive).

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