Question

why does it colour camera have four Videocon tube​

Answer 1

Answer:

A 3-tube colour camera, the luminance (black and white) signal is derived from a combination of the three colour signals, so severe demands are placed on the registration accuracy of the three images, if sharp pictures are to be achieved.

Answer 2

Answer:

Explanation:

With such a camera, a sharp black and white picture was always assured, as it was not necessary to combine signals from the three colour tubes to provide the luminance detail. ... The camera had an image orthicon tube for the luminance channel and three vidicon tubes for the colour channels.