A widescreen film process (under such trademark names as CinemaScope and Panavision) used to create an image wider than conventional television’s. The aspect ratio of most films made with anamorphic lenses today is 1:2.40 (modified slightly from 1:2.35, which was the standard in the 1950s), while the conventional television image’s aspect ratio is 1:1.33.

Wikipedia article

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