During the early 1950s CinemaScope was the first successful anamorphic lens and projection system for widescreen films. In the CinemaScope system, a special anamorphic camera lens was used to capture a widescreen image and horizontally squeeze it onto the 35 mm frame. When projected, the 35 mm print image was expanded horizontally by the same amount using a similar anamorphic lens. This expansion during projection produced a wide screen image with an aspect ratio of 2.35:1 with optical sound, or 2.55:1 when magnetic sound was used.
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