A camera is a device that records
images that can be stored directly, transmitted to another location, or both.
These images may be still photographs or moving images such as videos or
movies. The term camera comes from the word camera obscura (Latin for
"dark chamber"), an early mechanism for projecting images. The modern
camera evolved from the camera obscura.
Cameras may work with the light of
the visible spectrum or with other portions of the electromagnetic spectrum. A
camera generally consists of an enclosed hollow with an opening (aperture) at
one end for light to enter, and a recording or viewing surface for capturing
the light at the other end. A majority of cameras have a lens positioned in
front of the camera's opening to gather the incoming light and focus all or
part of the image on the recording surface.
The diameter of the aperture is
often controlled by a diaphragm mechanism, but some cameras have a fixed-size
aperture. Most cameras use an electronic image sensor to store photographs on
flash memory. Other cameras, particularly the majority of cameras from the 20th
century, use photographic film.
A typical still camera takes one
photo each time the user presses the shutter button (except in continuous-fire
mode). A typical movie camera continuously takes 24 film frames per second as
long as the user holds down the shutter button, or until the shutter button is
pressed a second time.
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