What does the camera zoom mean? What is the principle?

Refers to the optical zoom factor. The larger the factor, the farther the shooting distance. If a close-up is required, the larger the magnification, the better. The focal length of the camera has a starting focal length and a maximum focal length. The maximum focal length divided by the starting focal length is its zoom factor. The smaller the starting focal length, the better the wide angle shot. The focal length of the camera is a characteristic of the product. If you want to know the principle, there are physics booksellers in the second grade of junior high school.

The larger the signal-to-noise ratio, the better the image effect; the smaller the minimum illumination, the better the image! The quality of a camera mainly depends on these points!