camera's dimensions were in size, and weighed . It consumed 6.50 watts of power. Its bayonet lens mount allowed for quick changes for the two interchangeable lenses used on Apollo 11: a wide-angle and a lunar day lens. Camera Lenses Westinghouse lunar color camera Choosing a color process Color broadcast studio television cameras in the 1960s, such as the RCA TK-41, were large, heavy and high in energy consumption. They used three imaging tubes to generate red, green and blue (RGB) video signals which were combined to produce a composite color picture. These cameras required complex optics to keep the tubes aligned. Since temperature variations and vibration would easily put a three-tube system out of alignment, a more robust system was needed for lunar surface operations. In the 1940s, CBS Laboratories invented an early color system that utilized a wheel, containing six color filters, rotated in front of a single video camera tube to generate the RGB signal. Called a field-sequential color system, it used interlaced video, with sequentially alternating color video fields to produce one complete video frame. That meant that the first field would be red, the second blue, and the third field green – matching the color filters on the wheel. This system was both simpler and more reliable than a standard three-tube color camera, and more power-efficient. The camera Lebar and his Westinghouse team wanted to add color to their camera as early as 1967, and they knew that the CBS system would likely be the best system to study. The Westinghouse lunar color camera used a modified version of CBS's field-sequential color system. A color wheel, with six filter segments, was placed behind the lens mount. It rotated at 9.99 revolutions per second, producing a scan rate of 59.94 fields per second, the same as NTSC video. Synchronization between the color wheel and pickup tube's scan rate was provided by a magnet on the wheel, which controlled the sync pulse generator that governed the tube's timing. The color camera used the same SEC video imaging tube as the monochrome lunar camera flown on Apollo 9. The camera was larger, measuring long, including the new zoom lens. The zoom lens had a focal length variable from 25 mm to 150 mm, i.e. a zoom ratio of 6:1. At its widest angle, it had a 43-degree field of view, while in its extreme telephoto mode, it had