Is the documentary usually a single machine or a dual machine?

Documentaries are generally stand-alone. According to official website, people who took the art test inquired about it. Documentaries are generally stand-alone. According to the inquiry, a large number of documentaries will be shot with a single lens, because a single lens can better record the whole process of this recorded object. Secondly, the post-production of a single camera is relatively simple, which can bring a better viewing experience to the audience. The shooting cost of a single camera is lower than that of a dual camera, which is its advantage. A single camera is recorded by a photographer.