Intermittent effect

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The intermittent effect is an effect in the exposure that occurs in analog photography . Similar to the Schwarzschild effect , it is an exception to the reciprocity law .

The effect shows up with multiple exposures ( flashes ) at short intervals as a decrease in film speed. The blackening of the film is therefore less in these cases than with long-term exposure with the same light intensity. As with the Schwarzschild effect, which requires longer exposure, the intermittent effect requires more flashes or the number of flashes to be reduced, for example by opening the aperture or increasing the light intensity.