Radiant exposure (photography)


In photography, exposure is the amount of light per unit area (the image plane illuminance times the exposure time) reaching a photographic film, as determined by shutter speed, lens aperture and scene luminance. Radiant exposure is the radiometric quantity of visible light energy. It is the product of image-plane irradiance and time, the accumulated amount of incident “light” energy per area.

Related formulas


HeThe radiant exposure (J/m2)
EeThe irradiance (power of electromagnetic radiation per unit area incident on a surface) (W/m2)
tTime of exposure ( the length of time a camera's shutter is open when taking a photograph) (sec)