Understanding Your Camera's Light Meter
From Liz Masoner, former About.com Guide
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What is a Light Meter?
A light meter showing proper exposure
© 2007 Liz Masoner licensed to About.com, Inc.
A light meter is an instrument inside your camera that tells you if the amount of light reaching the film will be enough or too much to properly expose your image. The light meter takes into account your shutter speed, film speed, and aperture settings.