Film EOPA Practice Test

The main idea is that the key light is the primary source used to define the subject’s shape, and its position creates depth through light and shadow. Placing it off to the side of the camera-subject axis and elevated above the subject—about a 45-degree angle—is standard because it sculpts the face: one side is lit more, the other falls into natural shadow, giving you dimension and contour. If the light were aimed straight at the nose, the face would look flat with little depth. If it were down below the face, shadows would sweep upward in an unflattering way. A light behind the subject wouldn’t illuminate the front at all, leaving the subject under-lit.