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In photography, reciprocity is the inverse relationship between the intensity and duration of light that determines the reaction of light-sensitive material. Within a normal exposure range for film stock, for example, the reciprocity law states that the film response will be determined by the total exposure, defined as intensity × time.
The mired value associated with a given color temperature is computed as the reciprocal of the color temperature, in Kelvin, multiplied by : M = 10 6 T {\displaystyle M={\frac {{10}^{6}}{T}}} The shift is the difference in the mired values of the film and light source.
A developable photographic latent image forms when crystals of silver halide in an emulsion layer are exposed to light. The initial nucleation phase is chemically and thermodynamically unstable; it is thus temperature sensitive, and involves the production of one, or very few silver atoms as sub-latent image specks in each silver halide crystal.
Popular exposure chart type, showing exposure values EV (red lines) as combinations of aperture and shutter speed values. The green lines are sample program lines, by which a digital camera automatically selects both the shutter speed and the aperture for given exposure value (brightness of light), when set to Program mode (P) .
Brand Model name Sensor size Effective megapixels Lens mount Viewfinder coverage Metering zones Focus points Lowest ISO Highest ISO Cont. shtg LCD size Live view Movie mode Memory card
An example of the use of f-numbers in photography is the sunny 16 rule: an approximately correct exposure will be obtained on a sunny day by using an aperture of f /16 and the shutter speed closest to the reciprocal of the ISO speed of the film; for example, using ISO 200 film, an aperture of f /16 and a shutter speed of 1 ⁄ 200 second. The f ...
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Reciprocity (photography), the relationship between the intensity of the light and duration of the exposure that result in identical exposure; Reciprocity of twist and wrench, in screw theory; Reciprocity theorem (disambiguation), several unrelated results; Reciprocity of antenna transmitting and receiving characteristics