While shooting a scene, how do they focus other people’s reactions?

Capturing the reactions of other people in the frame is essential for conveying emotion and storytelling. Here are a few techniques that you can use-

Filmmakers and cinematographers often employ techniques such as the "Two Shot," featuring both the main subject and the person reacting in the same frame, or use over-the-shoulder shots to capture the reaction from behind the main subject's shoulder. They carefully compose shots to ensure that reactions are visible and impactful. 

A close-up shot conveys the intensity of an emotional response, while a wide shot captures a larger group of people reacting together. By selecting the appropriate camera angle, you can heighten the impact of the reactions.

Manipulating the depth of field is another technique that helps focus on reactions. By using a shallow depth of field, you van keep the main subject in sharp focus while slightly blurring the background, drawing the viewer's attention to the reactions happening in the frame.

To create a seamless connection between the main subject and their reactions, you need to use eye-line matches. This technique ensures that the eyelines of the main subject and the person reacting are aligned, creating a visual connection between the two and enhancing the viewer's engagement with the scene.

During the editing process, you need to emphasize on reactions by cutting to close-ups of individual reactions or using quick cuts to show a series of different people responding to the main subject's actions or dialogue. This editing technique intensifies the impact of the reactions on the audience.