Current Practice
Eventually, aspect ratios of 1.85:1 in North America and 1.66:1 in Europe became standard for 35mm productions shot with normal non-anamorphic lenses. However, the way the aspect ratio is created with these films is not in-camera, but rather by placing a cropping device, known as an aperture mask, over the film in the projector. What this means is that most films are shot in full screen format (often incorrectly referred to as 1.33:1 but actually 1.37:1 because of the sound tracks), but composed for 1.85:1 or 1.66:1 and cropped that way in projection. Therefore, a fair percentage of the film is wasted, because the cropped top and bottom are never meant to be shown. 3-perf and 2-perf are only used in the origination and post-production transfer process.
Read more about this topic: Negative Pulldown
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