A photometer is an instrument used to measure the intensity of light reflected from a surface. It works by comparing the reflected light with a standard internal light source, allowing accurate assessment of brightness and exposure levels.
Photometers are widely used in photography, cinematography, and scientific applications to ensure proper lighting, correct exposure, and consistent image quality. By providing precise measurements, photometers help photographers and technicians achieve predictable results under varying lighting conditions, making them an essential tool for both studio and field work.