Measuring the Light
As we saw in Chapter 6, “Digital Photography Foundations,” the proper exposure for a photograph is achieved through a combination of aperture, shutter speed, and the ISO sensitivity of the image sensor. A light meter, either in the camera or an external, handheld model, is used to determine the optimal exposure settings by evaluating how much light is being reflected back from the scene being photographed. Most cameras have built-in light meters that do a good job of calculating an adequate exposure setting, and higher-end cameras offer more sophisticated meters that produce excellent results. For photographers, this feature is definitely a case of “better living through technology”; you can concentrate more on the composition ...
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