BS 5550-3.2.4:1978

Taking and projection by normal motion-picture techniques, not those using anamorphotic lenses or proprietary techniques. Image area produced by camera aperture and projected, for aspect ratio 1:1.375. For wide aspect projection, ratio for optimum composition and range of ratios for acceptable composition. Position of 'head line' for all wide aspect ratios. Areas for titles and inserts.

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