Traditional Culture Encyclopedia - Photography and portraiture - Photography practice in which reciprocity law is invalid
Photography practice in which reciprocity law is invalid
In the process of photography, in the shooting stage, in the darkroom amplification stage, in black-and-white film and color film photography, the failure of reciprocity law is often encountered. At dusk and dawn, and in the case of dark indoor light, the exposure time is very long, which often leads to underexposure or color cast.
The failure of reciprocity law should be grasped in photographic exposure. When using all kinds of films, we should fully understand their performance, especially pay attention to the reciprocal law exposure increment data provided by film manufacturers. For example, Kodak 35 mm film in the United States was shot in dim light. When the exposure time measured by the exposure meter is 1 sec,1sec and 100 sec respectively, the actual exposure time should be 2 sec, 50 sec and 1200 sec respectively. On the contrary, when shooting under high-speed electronic flash, if the exposure time measured by the exposure meter is110000 seconds, it is necessary to increase the aperture by half a step compared with the normal exposure.
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