Extinction meter
An early type of exposure calculator.
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Extinction MetersEdit
Another type of early meter, the extinction meter, depended on eyesight: the user looks through the meter at a row of numbers, each behind a celluloid window of different opacity, ...
-Extinction meter - early type of exposure calculator.
Photo Glossary - F
-Factor - number that tells how many times exposure must be increased in order to compensate from loss of light.
Extinction meters suffered from the problem that they depended on the light sensitivity of the human eye (which can vary from person to person) and subjective interpretation.
 See also: Exposure, Type, Meter, Correct exposure, Speed
  
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