Which pair of factors directly influences shadow hardness?

• A. The size of the source relative to the subject and the distance from the source to the subject
• B. The color temperature and the distance from the subject to the background
• C. The shape of the subject and ambient light level
• D. The lens focal length

Answer: (A)

Shadow hardness is governed by how large the light source appears to the subject and how close the light is. A light source that looks big to the subject (or is very close) sends light from many angles, so the transition from light to shadow is gradual, producing a soft shadow with a feathered edge. If the light is small or far away, the rays are more directional, resulting in a sharp, well-defined shadow edge. The two factors that directly control this are the size of the source relative to the subject and the distance from the source to the subject. Other factors like color temperature, background distance, subject shape, ambient light, or lens effects don’t determine edge sharpness in the same direct way.