Visual effects work at Industrial Light & Magic quickly stretched the company to its operational limits. While the research and development work and experience gained from the previous two movies in the trilogy allowed for increased efficiency, this was off-set by the desire to have the closing movie raise the bar set by each of those movies. A compounding factor was the intention of several departments of Industrial Light & Magic to either take on other movie work or decrease staff during slow cycles. Instead, as soon as production began, the entire company found it necessary to remain, running twenty hours a day on six-day weeks in order to meet their goals by April 1, 1983. Of about nine hundred visual effects shots, all VistaVision optical effects remained in-house, since Industrial Light & Magic was the only company capable of using the format, while about four hundred 4-perf opticals were subcontracted to outside effects houses. Progress on the opticals was severely slow for a time, due to Industrial Light & Magic rejecting about one hundred thousand feet (30,480 meters) of film when the film perforations failed image registration and steadiness tests.

Film

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