MOTION CAMERA
A video camera is camera used to make electronic motion pictures. It captures moving images and synchronous sound. Early video cameras were all analog and most modern ones are digital. Analog video cameras produce signals that can be displayed with analog televisions. The signals can be shown at the time, or can be stored in an analog format on magnetic tape. Digital video cameras produce digital images.

Video cameras were invented early in the 20th century for television use, and by the end of the century, people could buy digital video cameras, which can almost immediately display the image. Video recorders that could record the image on magnetic tape were created in the middle 20th century.

At first, video cameras were large and expensive. Only professionals operated them. As the electronics industry advanced, and solid state circuits with transistors and microprocessors replaced vacuum tubes, video cameras became smaller and inexpensive. Now many mobile phones and other consumer electronic devices include video cameras. In addition, software is now widely available to edit or to compress the output from video cameras.

Components
Camcorders have three major components: lens, imager and recorder. The lens gathers light, focusing it on the imager. The imager (usually a CCD or CMOS sensor; earlier models used vidicon tubes) converts incident light into an electrical signal. The recorder converts the electrical signal to video, encoding it in a storable form. The lens and imager comprise the "camera" section.

Lens
The lens is the first component of the light path. Camcorder optics generally have one or more of the following controls:

Aperture (or iris): Regulates exposure and controls depth of field
Zoom: Controls focal length and angle of view
Shutter speed: Regulates exposure to maintain desired motion portrayal
Gain: Amplifies signal strength in low-light conditions
Neutral density filter: Regulates exposure intensity
In consumer units these adjustments are often automatically controlled by the camcorder, but can be adjusted manually if desired. Professional-grade units offer user control of all major optical functions.

Imager
The imager converts light into an electrical signal. The camera lens projects an image onto the imager surface, exposing the photosensitive array to light. This light exposure is converted into an electrical charge. At the end of the timed exposure, the imager converts the accumulated charge into a continuous analog voltage at the imager's output terminals. After the conversion is complete, the photosites reset to start the exposure of the next video frame.

Recorder
The recorder writes the video signal onto a recording medium, such as magnetic videotape. Since the record function involves many signal-processing steps, some distortion and noise historically appeared on the stored video; playback of the stored signal did not have the exact characteristics and detail as a live video feed. All camcorders have a recorder-controlling section, allowing the user to switch the recorder into playback mode for reviewing recorded footage, and an image-control section controlling exposure, focus and color balance. The image recorded need not be limited to what appeared in the viewfinder. For documenting events (as in law enforcement), the field of view overlays the time and date of the recording along the top and bottom of the image. The police car or constable badge number to which the recorder was given, the car's speed at the time of recording, compass direction and geographical coordinates may also be seen.

Types
Modern video cameras have numerous designs and uses, not all of which resemble the early television cameras.

Professional video cameras, such as those used in television production and sometimes filmmaking in digital cinema; these may be studio-based or mobile in the case of an electronic field production (EFP). Such cameras generally offer extremely fine-grained manual control for the camera operator, often to the exclusion of automated operation.

Camcorders, which combine a camera and a VCR or other recording device in one unit; these are mobile, and are widely used for television production, home movies, electronic news gathering (ENG) (including citizen journalism), and similar applications. Some digital ones are

Pocket video cameras.

Closed-circuit television (CCTV) generally use pan tilt zoom cameras (PTZ), for security, surveillance, and/or monitoring purposes. Such cameras are designed to be small, easily hidden, and able to operate unattended; those used in industrial or scientific settings are often meant for use in environments that are normally inaccessible or uncomfortable for humans, and are therefore hardened for such hostile environments (e.g. radiation, high heat, or toxic chemical exposure).

Webcams are video cameras which stream a live video feed to a computer. Larger video cameras (especially camcorders and CCTV cameras) can be similarly used, though they may need an analog-to-digital converter in order to store the output on a computer or digital video recorder or send it to a wider network.

Most 21st century video cameras are digital cameras which convert the signal directly to a digital output; such cameras are often small, even smaller than CCTV security cameras, and are often used as webcams or optimized for still-camera use. The majority are incorporated directly into computer or communications hardware, particularly mobile phones, though analog video equipment remains in use.

Special systems, like those used for scientific research, e.g. on board a satellite or a spaceprobe, or in artificial intelligence and robotics research. Such cameras are often tuned for non-visible radiation for infrared photography (for night vision and heat sensing) or X-ray (for medical and video astronomy use).

Special uses of video cameras include systems that capture images at the finish line to time races and sporting events. Some toll roads use video cameras to make pictures of the license plate of any car that fails to pay tolls. Computers then identify the drivers and mail enforcement letters to collect the missed tolls.

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