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Don't know anything in particular about this camera, just general stuff about 1-tube color cameras. These all (except for certain Sony's, as far as I recall) used yellow and cyan color stripes on the target to create blue and red modulation of the video. This made them very critical as to electrical focus in the pickup tube. They were also smeary, noisy, and not very sensitive compared to CCD cameras. Also, the non-linear response of the vidicon tube produced a cross-modulation between red, blue, and luminance that tended to desaturate greens and emphasize reds and blues. Don't know what the target material was in a Cosvicon; it could have improved the sensitivity and non-linearity.
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