What focal length is used for first person perspective?

If it is full frame, you can use a constant large aperture lens with a focal length of 24-70, but it may not be very good at fixing the focus when shooting videos. 24-70 covers wide-angle to medium focal lengths, covering commonly used focal lengths. The constant large aperture can bring good blur effects and create atmosphere, and can also take care of low-light shooting.

Related expansion: Focal length, as the name suggests, is the segmentation of the focal length of the lens. Generally divided into super wide angle, wide angle, standard, medium focus, medium telephoto, telephoto, and super telephoto. All film, digital cameras, camcorders (cameras used to record on tape, but now also record on digital), and movie cameras have focal lengths that are divided relative to their own frames.