 After the EMI board granted approval for the new camera, in late 1964, work on it progressed rapidly.The camera was to use four Plumbicon pick-up tubes, to use solid state circuitry, include a zoom lens as standard and to use prism optics.After the late start, the first fully operational prototype was shown to the BBC and others in 1966, only just in time to meet BBC time-scales for the introduction of their new colour service.