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Every camera consists of some kind of enclosed chamber, with an opening or aperture at one end for light to enter, and a recording or viewing surface for capturing the light at the other end. This aperture is often controlled by an iris mechanism.
While the aperture controls the amount of light that enters the camera during photographing, the shutter controls the length of time that the light hits the film. For example, in lower light situations, the shutter speed should be slower to allow the film to capture what little light is present.
There are various ways of focusing a camera accurately. The simplest cameras have fixed focus and use a small aperture and wide-angle lens to ensure that everything within a certain range (usually around 3 meters - infinity) is in reasonable focus. This is usally the kind found on one-use cameras and other cheap cameras. The camera can also have a limited focusing range or scale-focus that is indicated on the camera body. The user will guess the distance to the subject and adjust the focus accordingly. On some cameras this is indicated by symbols (head-and-shoulders; two people standing upright; one tree; mountains).
Rangefinder cameras focus by means of a coupled parallax unit on top of the camera. Single-lens reflex cameras using the objective lens and a moving mirror to project the image onto a ground glass. Twin-lens reflex cameras use an objective lens and a focusing lens unit in a parallel body to focus. View cameras use a ground glass image which is removed and replaced by the photographic plate before exposure.Traditional cameras capture light onto photographic film or photographic platePhotographic plates were one of the earliest forms of photographic film, in which a light-sensitive emulsion of silver salts was applied to a glass plate. This form of photographic emulsion largely faded from the consumer market in the early years of the. Video and digital cameras use electronicsElectronics is the study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. The pure study of such devices is considered as a bra, usually a charge coupled device (CCD) to capture images which can be transferred or stored in tape or computer memory inside the camera for later playback or processingDigital image processing is the study of algorithms applied to digital images. Typical problems covered by this field include geometric transformations such as enlargement, reduction, and rotation; color corrections such as brightness and contrast adjustm.
Cameras that capture many images in sequence are known as movie cameraThe movie camera is a type of photographic camera which takes a rapid sequence of photographs on film; once developed this film can be projected as a motion picture. In contrast to a still camera which captures a single snapshot at a time, the movie camers; those designed for single images are still cameraA camera is a device used to take photographs. Traditional cameras capture light onto photographic film. Digital cameras use electronics, usually a charge coupled device (CCD) to store digital images in computer memory inside the camera, which can be trans. However these categories overlap, as still cameras are often used to capture moving images in special effects work and modern digital cameras are often able to trivially switch between still and motion recording modes.
Cameras that take 3-D photographs are known as stereo camera s. Stereo cameras for making 3D prints or slides have two lenses side by side. Stereo cameras for making lenticular prints have 3, 4, 5 or even more lenses
Some film cameras feature date imprinting devices that can print a date on the negative itself.