What are the best techniques for achieving optimal lighting in a circle film setup?

To achieve optimal lighting in a circle film setup, consider using a combination of key, fill, and backlighting techniques. Key lighting provides the main source of illumination, while fill lighting helps to reduce shadows and create a balanced look. Backlighting adds depth and separation between subjects and the background. Additionally, using diffusers and reflectors can help soften harsh lighting and create a more natural and flattering effect. Experimenting with different angles and intensities of light can also help achieve the desired cinematic look.