here are the engineering notes on the video camera used during the missions
http://www.hq.nasa.gov/alsj/WEC-Engineer-3-1968.pdf
apparently, when the camera is in "slow scan" mode, the camera can produce "quality" pictures, however, according to the document, the scan resolution is 10 frames per second at 320 lines per frame and in "slow scan" mode you get 1 frame per about 1/2 second (5/8 frame per second @ 1280 lines per frame)
the sensitivity of the camera is impressive showing a scene illumination of .007 ft lamberts to 12,000 ft lamberts
its operating temparture is from 0 to 130 degrees Fahrenheit
when i was little i had to wonder if the vacuum tube was an open design as there would be no need for a tube to contain the detector since it is designed for an airless environment.