reciprocity effect
the extent to which time/light intensity ratios affect exposure.
reciprocity law
photographic rule stating that exposure is a function of the product of both exposure time and light intensity, not of either variable alone.
Reciprocity effect (reciprocity failure). A shift in the color balance or the darkness of an image caused by very long or very short exposures.
be caused by normal manufacturing variations from one emulsion to another, adverse conditions before exposure, illumination of different color quality, variance in sensitivity with changes in illumination level and exposure time (reciprocity effect), ...
RECIPROCITY FAILURE - When a film's speed cannot be relied upon for proper exposure at slow shutter speed, reciprocity failure (or the "Reciprocity effect") is said to occur.
Previously my film of choice was EPP100 4x5 but Kodak informed me that E100S doesn't suffer from the reciprocity effect like EPP100 does. They were right. It also renders the color of river water here in the Italian Dolomites more accurately.
When an exposure time falls outside of this range a film's characteristics may change. Loss of effective film speed, contrast changes, and colour shifts are the common results. This is called reciprocity effect.
Loss of effective film speed, contrast changes, and (with color films) color shifts are the three common results. These changes are called reciprocity effect.
range-becoming either significantly longer or shorter-a film's characteristics may change. Loss of effective film speed, contrast changes, and (with color films) color shifts are the three common results. These changes are called reciprocity effect.
 See also: Light, Subject, Film, Print, Photograph
  
|
RSS
