spot meter

A spot meter is a specialized photographic device used for measuring the intensity of light reflected from a very specific, small area within a scene. Unlike general exposure meters that measure incident light (falling on the subject) or reflected light from a wider area, a spot meter has an optical system that can isolate and measure light from a spot as small as one degree. This precision is invaluable on exterior locations, allowing photographers to accurately gauge the light on particular elements of a subject, especially in challenging lighting conditions like strong backlighting or scenes with extreme contrast between bright and dark areas. This detailed measurement helps ensure correct exposure for selected parts of the image, contributing to the overall photographic style and consistent tonal rendering.1