processed film images taken by the Orbiter for transmission back to Earth.

The CBS Laboratories Reconotron all-electrostatic image dissector tube was developed for the 1964 Mariner IV Mars mission as an azimuth star tracker, then was modified for the 1967 Mariner V Venus mission in order to withstand the intense planetary illumination. The sensor was further modified for the 1969 Mariner mission to Mars to survive the more severe launch environment and to provide greater capability for automatic