The ratio of the vertical to the horizontal image size. Attenuation This refers to signal loss in a transmission system. A lens that adjusts automatically to allow the right amount of light to fall on the imaging device. This is important when a zoom lens is fitted. Used in situations where the cabling distance is too great.
Video uses higher frequency than audio, thus requires a wider bandwidth.
The distance from the flange surface to the focal point is 17.526 mm. CCIR Commite Consultatif International Radiotelegraphique. This is a standards committee of the International Telecommunications Union, who have made the technical recommendation for the European 625 line standard for video signals. CRT Cathode Ray Tube. The main part of a normal monitor or television.