In video, the representation of a camera scene by varying voltages in the video signal, the voltage being directly proportional to the light level.

The precise combination of two fields of 312 1/2 lines to create a single frame of 625 lines. (CCIR)

Automatic gain control- electronic circuitry to increase the video signal in low light conditions. This usually introduces ‘noise’ in the picture giving a grainy appearance. Camera specifications shou [..]

From selecting ‘record’, a normal V.C.R. would take from 15 to 21 seconds before it actually starts recording usable pictures. With this type of recorder it can be set so that the tape is spooled up a [..]

Mathematics, a rule or procedure for solving a problem

The light gathering area of a lens. The iris controls the size of the aperture.

Extra protection for a cable that improves resistance to cutting and crushing. The most common material used is steel.

The ratio of the vertical to the horizontal image size. This is 3:4.

A term that refers to signal loss in a transmission system or light loss through a lens system.

A lens that automatically adjusts to allow the correct amount of light to fall on the imaging device. There are a tiny motor and amplifier built in which generally receives a control signal from the c [..]