Which statement best defines incident light reading?

Which statement best defines incident light reading?

• A. The light that is actually falling on the subject
• B. The light reflected back to the lens
• C. The light emitted by the subject
• D. The light that fills the frame

Answer: (A)

Incident light reading describes the amount of light that is actually falling onto the subject. A light meter with a diffusing dome is used at the subject’s location to capture the illumination arriving on the subject, so the exposure is based on how bright the light is rather than on how bright or dark the subject appears. This makes the reading independent of the subject’s reflectivity or color, which is why it’s reliable across different subjects. The other ideas describe light behavior that isn’t about what lands on the subject: light reflected back to the lens depends on the subject’s reflectance, light emitted by the subject is self-generated, and light that fills the frame concerns overall scene lighting rather than the exposure at the subject.

Incident light reading describes the amount of light that is actually falling onto the subject. A light meter with a diffusing dome is used at the subject’s location to capture the illumination arriving on the subject, so the exposure is based on how bright the light is rather than on how bright or dark the subject appears. This makes the reading independent of the subject’s reflectivity or color, which is why it’s reliable across different subjects.

The other ideas describe light behavior that isn’t about what lands on the subject: light reflected back to the lens depends on the subject’s reflectance, light emitted by the subject is self-generated, and light that fills the frame concerns overall scene lighting rather than the exposure at the subject.