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==Exposure control== [[File:Kew fountain (long exposure).jpg|100px|right|thumb|A 1/30 s exposure showing motion blur on fountain at [[Royal Botanic Gardens, Kew]]]] [[File:Kew fountain (short exposure).jpg|100px|right|thumb|A 1/320 s exposure showing individual drops on fountain at [[Royal Botanic Gardens, Kew]]]] An appropriate exposure for a photograph is determined by the sensitivity of the medium used. For photographic film, sensitivity is referred to as [[film speed]] and is measured on a scale published by the [[International Organization for Standardization]] (ISO). Faster film, that is, film with a higher ISO rating, requires less exposure to make a readable image. [[Digital camera]]s usually have variable ISO settings that provide additional flexibility. Exposure is a combination of the length of time and the [[illuminance]] at the photosensitive material. Exposure time is controlled in a [[camera]] by [[shutter speed]], and the illuminance depends on the lens [[aperture]] and the scene [[luminance]]. Slower shutter speeds (exposing the medium for a longer period of time), greater lens apertures (admitting more light), and higher-luminance scenes produce greater exposures. An approximately correct exposure will be obtained on a sunny day using ISO 100 film, an aperture of {{f/|16|link=yes}} and a shutter speed of 1/100 of a second. This is called the [[sunny 16 rule]]: at an aperture of {{f/|16}} on a sunny day, a suitable shutter speed will be one over the film speed (or closest equivalent). A scene can be exposed in many ways, depending on the desired effect a photographer wishes to convey.
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