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An indicating instrument used in photography to determine lens aperture and shutter speed. An exposure meter may be used either in the darkroom to...
Exposure meters (in 'Camera' article)
To determine the optimal shutter speed and aperture combination for the film or image sensor, it is necessary to determine the brightness of the scene


= Encyclopedia Article; = Research Update
Basic exposure meter circuits. (a) Photovoltaic type circuit. (b) Photoconductive type circuit.
From Encyclopedia article 'Exposure meter'
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