Why don’t we use digital cameras when making movies?

There is a slight difference in the cameras used to shoot movies now, that is, they use "high-definition digital cameras" instead of digital cameras.

Give me an example?

Zhang Yimou's "Three Guns: Surprise" was shot with a high-definition digital camera F35.

1. In terms of picture quality:

The resolution of the 35mm film negative (Negative Film Stock) is 4K, and the release copy (Film Print) is 1K

Digital HD can theoretically reach 2K resolution, but due to limitations of the transmission code stream, the resolution of the material is generally 1.25K. There is no loss in high-definition production, and the final product can also reach 1.25K, so in terms of picture clarity Look, HD is enough.

However, although the film image looks not as clear as high-definition TV, it is softer. Although the image of high-definition TV is very sharp, it feels hard.

The reason is simple. The modulation degree of the 35mm release projection copy in the 20-30MHz range is lower than that of high-definition TV. Film still has output above 30MHz, but HDTV output drops dramatically to zero.

2. Contrast (gamma) curve

The high-definition machine is set up to imitate the gamma curve of film, so while sacrificing some details, the high-definition machine can also achieve the performance of film. Contrast curve.

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