Photography is the science and art of creating visual recordings of electromagnetic radiation, usually visible light. Photography records images either electronically using sensors or chemically using light-sensitive material such as photographic film.
The Radiant Exposure calculator computes the radiant exposure based on the irradiance of the surface and the time of exposure.
The Luminous Exposure calculator computes the luminous exposure based on the illuminance of the surface and the time of exposure.
This equation computes the f-stop or f-number of an optical system.
The Forced Perspective calculator computes the angle based on the height of the object and distance to the object.