What does an Extreme Close Up (ECU) focus on?

An Extreme Close Up (ECU) is a shot that emphasizes a specific part of a whole object, often highlighting details that might otherwise be overlooked. This technique is used to draw the viewer's attention to particular features, such as a character's eyes, hands, or intricate details of an object, thereby intensifying emotional impact or providing critical narrative information. By isolating this specific element, the ECU can convey depth, emotion, or significance, enhancing the storytelling aspect of film and animation.

Other choices do not accurately reflect the purpose of an ECU. The idea of capturing the entire subject or the subject's full body pertains to wider shot compositions, which serve different narrative and visual functions. Focusing on background details would detract from the primary intention of an ECU, which is to focus on minute details within the frame.