All video cameras contain 3 major components – the lens, imager and recorder. The objective collects and focuses light on the imager, which is normally a charge-coupled (CCD) or CMOS sensor IC. Finally, the recorder will encode the video signal into a form that can be stored. Generally, optics and imaging are known as the camera section. The optical lens is the first element of the light path of the camera section. The optics normally have one or more of the following changes: 1. aperture – controls the amount of light 2. Zoom – control the field of view 3. Shutter Speed – Motion Capture continues in most consumer units, these adjustments are automatically controlled by the electronics of the camera, usually to maintain the permanent exhibition on the imager. The imager is the “eye” of the camera, a camera housing sensitive device or devices. The imager works to convert light into electronic video signals through a complex process mail. The camera lens projects an image on the imaging area, exposing the photo array sensitive to light. Exposure to light is then converted into an electric charge. Towards the end of the timed exposure, the imager converts the accumulated charge in a DC voltage across the analog output of the imager. The third piece, the writer, is responsible for writing the video signal on a recording medium such as magnetic videotape. The record function involves many steps of signal processing, and historically, the registration process introduced some distortion and noise of stored video, such as reading the stored signal may not retain the same level of detail feed origin live. All but the most primitive video cameras will also need to have a recording control section that lets you control the camera. You can also swich the recorder into playback mode for reviewing your recorded footage. The image you have registered need not be limited to what appears in the viewfinder. For a documentation of events such as those used by police, the fields of vision overlap of things like time and date of registration at the top and bottom of the image. As you can tell now, a high definition video camera is indeed very complex. There are several other parties, as well, although the above are the most important. An HD video camera is very complex to build, making it something that is worth the time it takes to create.