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4:3 (1.33:1) (generally read as Four-Three, Four-by-Three, or Four-to-Three) for standard television for fullscreen aspect ratio 1.33:1 has been in use since the invention of moving picture cameras, and many computer monitors used to employ the same aspect ratio. 4:3 was the aspect ratio used for 35 mm films in the silent era.
V-Lite 1.3× (2008) - The V-Lite series with a 1.3x squeeze factor, enabling the use of nearly the entire image area of 3-perf 35 mm film or the sensor area of a 16:9 digital camera to provide the 2.39:1 release format. V-Lite 16 (2008) - Lenses for 16 mm anamorphic production, in both 1.3x (for Super 16 mm) and 2x (for standard 16 mm).
The picture outside of the yellow box is matted out when the film is shown in widescreen. For 4:3 television and home media versions, a large portion of the picture can be used (inside the red box) with an open matte. Open matte example with a slight shift of the image section upwards. Aspect ratio 2.35:1 versus 1.85:1
Techniscope employs standard 35 mm camera films, which are suitable for 2-perf (Techniscope), 3-perf, conventional 4-perf (spherical or CinemaScope), and even 6-perf and 8-perf (VistaVision), as all of those processes listed employ the same negative and intermediate films, and positive print films intended for direct projection (although 2-, 3- and 8-perfs are not distribution formats).
When composing for 1.85:1, it is known as Super 1.85, since it was larger than standard 1.85. When composing for 2.39:1, there are two methods most frequently used: common center, which keeps the 2.39 extraction area at the center of the film, and common top, which shifts the 2.39 extraction area upwards on the film so that it shares a common top line with a centered 1.85:1 frame.
CinemaScope was developed to use a separate film for sound (see Audio below), thus enabling the full silent 1.33:1 aperture to be available for the picture, with a 2:1 anamorphic squeeze applied that would allow an aspect ratio of 2.66:1. When, however, developers found that magnetic stripes could be added to the film to produce a composite ...
The 64:27 aspect ratio of "21:9" is an extension of the existing video aspect ratios 4:3 (SDTV) and 16:9 (HDTV), as it is the third power of 4:3, where 16:9 of traditional HDTV is 4:3 squared. This allows electronic scalers and optical anamorphic lenses to use an easily implementable 4:3 (1. 3:1) scaling factor.
A good cell phone camera with typical pixel size 1.1 μm (Samsung A8) would have about 3 times worse SNR due to shot noise than a 3.7 μm pixel interchangeable lens camera (Panasonic G85) and 5 times worse than a 6 μm full frame camera (Sony A7 III).