The focus pull (also known as the rack focus) is a creative camera technique in which the camera changes focus during a continuous shot. Usually, this comes in the form of adjusting the focus from one subject to another.
This camera technique is useful for directing the viewer's attention. For example, if there are two people in shot but only one is in focus, that person is the subject of attention. If the focus changes to the other person, they then become the subject. This is often used in drama dialogues, as the focus shifts backwards and forwards between the people speaking. A slightly more subtle trick is to focus on a person speaking before pulling focus to another person's silent reaction.
The video shows two ornamental statues located on a table. The statue of the Ancient Greek god Zeus is placed close to the camera lens. Stood behind and to the right of Zeus is a statue of Medusa the Gorgon. By turning the focus ring one way, the camera is able to present Zeus' details clearly with no or very little blur effect, but causes the figure of Medusa to grow softer and become much less clear to see. On the other hand, turing the focus ring the other way, forces the camera to lose focus of Zeus, yet gain focus of Medusa.
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