Excuse me, when shooting a movie, did the photographer measure the actors with a ruler to focus on the camera? How about the furniture?

That's true. Especially when the light is dark, don't use autofocus, otherwise it will become continuous focus, and the photos taken are all virtual.

If it is a large aperture lens, it is necessary to measure the distance from the human eye to the CCD of the camera, so as to focus accurately.

In this focusing mode, it is necessary to measure the white balance, illuminance at each point, contrast and focal length for manual shooting. Then the photographer chooses more than three groups of exposure value according to experience, which is similar to the surround exposure of digital cameras. After the film is developed, choose a more suitable tone according to the situation.