How far can I shoot with 5 x optical zoom? How exactly is it converted?

Optical zoom multiple is one of the important parameters of zoom lens, and its multiple is expressed by the ratio of long focal length to short focal length of zoom lens. The greater the zoom magnification, the greater the change of the viewing range. If the optical zoom magnification is large, you can capture the distant view, panoramic view, middle view, close view, close view and other pictures of people without changing the shooting distance. When used in film and television photography, we can also get the effect picture of continuous zoom, which is the zoom push-pull lens picture we often see on the screen. Compared with digital zoom, the optical zoom of digital camera, such as Canon A7 10ls digital camera, is a six-fold optical zoom lens with a wide angle (short focus) of 5.8mm and a narrow angle (telephoto) of 34.8mm, and the ratio of the two numbers is 6, so it is a six-fold optical zoom lens. The zoom lens of traditional film cameras generally does not have the word "optical", but only talks about the zoom multiple of the lens, which is only 3/5 times that of general household digital cameras. It should be said that the greater the optical zoom coefficient, the greater the change of image size.