Why are movie machines all half-framed?

Because 35mm is a Quan Huafu photosensitive element, that is, the diagonal length of cmos is 35mm. This size comes from the film size of the film era, and the size of each 135 camera film is so large.

The dimensions and principles mentioned above come from still photography, that is, the photography industry. The problem now is the camera, which is the video industry.

Like the historical development of the photo industry, the cameras used in the video industry have also developed from using film to digital imaging. The camera industry has entered the film era before digital imaging, and the most popular film size is over 35mm, that is, over 35.

The original film camera used 35mm film, which is the kind of 135 film we use now. But the difference is that the frame of our 135 camera is 24mmX36mm, while the frame of S35 camera with similar film is less than half that of Quan Huafu, close to or slightly larger than APS-C.

The frame of the camera is horizontal and the frame of the camera is vertical. They use the same size film. To sum up briefly, these specifications and parameters are actually the technical specifications finally formed under the technological development and changes of the times.