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Chapter 3. Mastering Camera Controls >  Working with Autoexposure

Working with Autoexposure

Thanks to the tiny computers built into modern film and digital cameras, exposure can be determined accurately in a variety of situations. Most cameras have multiple metering modes which measure light in any of several different ways. This next section explains the most common modes and how they work.

Exposure Zones

Sophisticated electronic cameras divide the subject area into as many as a few dozen different zones, and can measure the light for each of these zones separately. Then, your camera’s programming can make decisions about how the differing illumination in the zones affects your photo and calculate an exposure based on those decisions. You can choose how the exposure is calculated yourself, too, if you understand how these zones work. Here are the most common metering schemes:


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