What focal length lens is used to shoot the suspension film?

Whenever a new friend who is just getting started asks this question, many so-called professionals recommend 85MM/ 1.4, 105MM/2, 135MM/2 and so on. As soon as they speak. It is said that the imaging is sharp, the background is blurred, and zooming is repulsive. It is said that photographers should not take pictures for fear of trouble. Is that really the case? I don't recommend shooting people with a fixed-focus lens above 85, because on digital machines, 85 is equivalent to the focal length of127 ~136 mm. If it is longer, for example, 135MM, you have to step back ten or twenty meters to shoot the whole body, which is really inconvenient to communicate with the person being photographed. I think beginners have a vague concept of focal length. First, use a standard zoom lens with a focal length of 28-85mm (in fact, the most common focal length I shoot is between 24-70mm, which makes the composition more convenient and flexible. Perhaps this statement is quite different from the focal length of 85- 135MM which is widely rumored in China. It's not too late to buy a fixed-focus lens with a specific focal length after you are familiar with these focal lengths. Some people say that the quality of fixed-focus imaging is good, which I don't deny, but how big can the difference be? Can you see the obvious difference without zooming in to 18 inch? If it is not professional commercial photography, general personal hobbies, or studio portraits will not care too much about the loss of zoom lens quality. Moreover, it is worthwhile to sacrifice a little image quality for the flexibility of composition and save the trouble of changing the lens. Others say that using a fixed-focus lens can make people calm down and devote themselves to photography, zooming and composition. Zoom lens will make people impetuous, and only zooming will keep still and composition will be more rigid. I think this statement is very incorrect. If an impetuous person uses fixed focus, he can't calm down and always wants to change the lens. A day's time is wasted on changing lenses, which will also damage the machine and the CCD will go up in smoke. If a cool-headed person uses a zoom lens, he will also walk back and forth to take pictures, and he can freely choose different focal lengths according to each scene without always thinking about changing the lens. Therefore, professionals should stop recommending novella focus to newcomers. This may just be your personal preference. Don't mislead new people, let others feel that filming people must focus on these.