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Video Cameras And Camcorders
Video cameras were primarily used for two purposes. The first: the camera feeds real time moving images directly on a television screen for immediate viewing. The second: for recording for later viewing or archiving. The videotape was the primary format in which moving images were stored, which is now being replaced by optical disc media, hard disk and flash memory. Modern video cameras neither resemble the early television cameras nor are they limited only to television use. Apart from professional use in television and some times film production, video cameras are also used in security, surveillance and monitoring through close circuit TV cameras. Recently, Camcorder, a portable consumer device has fast emerged as one of the most popular uses of technology related to video cameras. The three major components of video cameras include: the lens, imager and recorder. Lens: The first component in the light path is the lens. It requires various adjustments such as aperture settings to control depth of field and distance, zoom to control focal length and shutter speed to regulate exposure. It also requires adjustments in gain, which in electronics signifies amplifying signal strength. Imager: Modern cameras use CCD or CMOS as an imager. The lens projects an image on the surface of the imager, which exposes the photosensitive arrangement to light, which is converted to an electric charge. The imager converts the accumulated charge into continuous analogue voltage and sends them to its output terminals. After a scan-out is complete, the photo-sites on the imager surface are reset and ready to receive the next video frame. Recorder: This last section is responsible for recording and writes the video signal onto a recording medium: a magnetic videotape, optical disk media or hard disk. High definition or HD refers to a video system that uses higher resolution than standard definition (SD). Some of the latest models serve a dual purpose of capturing still as well HD video. Nikon and Canon were the first to launch single lens reflex digital cameras that include video capturing and recording. Recently HD capture has become a common feature in sophisticated video cameras including those meant for home use. Canon HG10 AVCHD Hard Disk Drive is compact in size and has 40 GB hard drive and gives 1920x 1080 resolution crystal clear images. Panasonic HDC-DX1 DVD includes nearly all features that anyone would like to see in a DVD camcorder. One of Sony’s top models is Sony HDR-CX7 AVCHD that contains Carl Zeiss Vario-Sonnar optics and Super SteadyShot optical image stabilization. This article is brought to you by Canon Australia - Video Cameras for the Home and Professionals About Canon Canon Australia is a leading provider of advanced, simple-to-use imaging solutions for businesses and consumers. Canon’s Australian R&D company, CiSRA, develops customised solutions for local customers, and exports digital imaging technologies for use in Canon products worldwide. Canon has ranked among the top-three US patent recipients for the past 16 years, and had global revenues of around $US39 billion in 2007. Canon Australia also operates Canon Finance Australia, which offers one-stop shopping for customers wanting leasing or finance services. Article Directory: http://www.articledashboard.com For more information, visit Video Cameras. Visit Canon Australia for more Canon products. |
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