Definition: States that exposure = intensity x times, where intensity is equal to the amount of light and time is equal to the time that amount of light is allowed to act upon the photographic emulsion.
Definition: The theoretical relationship between length of exposure and intensity of light, stating that an increase in one will be balanced by a decrease in the other. For example, doubling the light intensity should be balanced exactly by halving the exposure time. In fact, the law does not hold true for very long or very short exposures. This reciprocity failure or reciprocity effect causes underexposure unless the exposure is increased. It also causes color shifts in color materials.
Definition: The theoretical relationship between length of exposure and intensity of light, stating that an increase in one will be balanced by a decrease in the other. For example, doubling the light intensity should be balanced exactly by halving the exposure time. In fact, the law does not hold true for very long or very short exposures. This reciprocity failure or reciprocity effect causes underexposure unless the exposure is increased. It also causes color shifts in color materials.
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