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135 film. The film is 35 mm wide. Each image is
1007) is a
film format for still
photography. Introduced in its modern form in 1934 it
quickly grew in popularity, surpassing
120 film by the late 1960s to become the most popular
photographic film format. Despite competition from formats such
APS, it remains so today.
The film itself has the same dimensions and perforations as
35 mm movie print film but is enclosed in a light-tight
single-spool metal cassette to allow cameras to be loaded in
daylight. The film is clipped or taped to a spool and exits via
a velvet-covered slot. The end of the film is cut on one side to
form a leader, which is to be inserted into a corresponding slot
in the camera take-up spool.
Since the 1980s, film cassettes have been marked with a
DX encoding pattern for automatically setting the camera to
use the correct sensitivity value for the film. Different films
are sensitive to light at different degrees, this
film speed is standardised by ISO. Common film speeds for
consumers are ISO 100/21° through ISO 800/30°, although films
with much greater and much less sensitivity are available, and
are generally for professional use.