What is the primary benefit of having a dolly in film and video work?

The primary benefit of having a dolly in film and video work lies in its ability to facilitate smooth and controlled camera movements during filming. A dolly is a wheeled cart or similar device that allows the camera to move steadily along a track or through a space, which helps create dynamic shots that enhance the visual storytelling. This tool is particularly valuable in achieving fluid tracking shots, where the camera follows a subject or moves through a scene, contributing to an immersive viewing experience. Smooth movements can convey emotions and maintain the audience's engagement without the distractions that wobbling or jerky camera work might produce. This controlled movement is essential in professional filmmaking, where the visual aesthetic is crucial.

Additionally, while there are other important aspects of cinematography, such as focus and depth of field, these functions do not specifically highlight the key advantage of a dolly, which is providing that smooth motion necessary to bring scenes to life.