aspect ratio, and much later "stereo variable-area" aspect ratio, also called Dolby Stereo). The negative is usually 2.66:1 or, in rare cases, 2.55:1 or 2.35:1. The sole purpose of the change to 2.39:1 and, later, to 2.40:1, was to better hide so-called "negative assembly" splices (splices employed in the composited camera negative. This was not a production change, rather it was a recommended projection change.)

A Chilean film, Post Mortem, used anamorphic lenses with 16 mm film,