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|image_text= Gossen Sixtomat,<br/>a popular selenium meter
 
|image_text= Gossen Sixtomat,<br/>a popular selenium meter
 
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Revision as of 23:40, 20 October 2006

light meter

A light meter (short form meter) is a device that measures light to determine the proper exposure settings for a scene. Analog measuring instruments with photoelectric selenium photo cell as voltage source were the most common models of light meters for the average photographer. Nowadays digital instruments with other types of light sensors dominate the market, but selenium meters are still popular since they need no battery.

light meter makers

and many others

light meters in cameras

Automation of exposure control in cameras began with built-in selenium meters. Shutter speed and aperture had to be selected manually according to the meter's absolute or relative measured values. With the advent of electrically controlled diaphragms and shutters other light sensors like photo resistors, photo diodes became common parts in cameras. Both sorts of devices needed batteries for operation. Some additional electronic circuits combining meter with shutter and diaphragm units were just needed to get exposure control automated. This sort of camera emerged in the 1960ies.


Glossary Terms