Editing Photometer (section)

==Photography==
{{Main|Light meter}}
Photometers are used to determine the correct [[exposure (photography)|exposure]] in [[photography]]. In modern [[camera]]s, the photometer is usually built in. As the illumination of different parts of the picture varies, advanced photometers measure the light intensity in different parts of the potential picture and use an algorithm to determine the most suitable exposure for the final picture, adapting the algorithm to the type of picture intended (see [[Metering mode]]). Historically, a photometer was separate from the camera and known as an [[exposure meter]]. The advanced photometers then could be used either to measure the light from the potential picture as a whole, to measure from elements of the picture to ascertain that the most important parts of the picture are optimally exposed, or to measure the incident light to the scene with an integrating adapter.