Friday, March 14, 2008

RECIPROCITY FAILURE

Definition: Films are designed to be exposed within a limited but practical brightness range. Reciprocity failure occurs when a film is exposed under conditions that are not within its design range. It usually becomes evident with very low shutter speeds, such as those used in dim night scenes. As a result of reciprocity failure, colour balance will shift and colours will seem less natural looking.

Definition: in photographic emulsions occurs when exposure times fall outside a films normal range. At these times an increase in exposure is required in addition to the assessed amount. This can be achieved either by increasing intensity or time.


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