The chapter covered many issues concerning understanding and controlling exposure. Some of the key points included the following:

■ When the exposure is just right, allowing the correct amount of light to reach the image sensor, you'll end up with a pleasing and accurate photograph.

■ The two mechanisms that control the exposure are the aperture (or the size of the hole through which light can pass) and the shutter (which opens and closes the light path).

■ Cameras have four methods for setting exposure, though not all cameras offer them all: auto, aperture priority, shutter priority, and manual.

■ You can finesse exposure using exposure compensation, ISO equivalencies, bracketing, and the histogram tool.

■ Program modes are preset options that automatically choose the right exposure, f -stop, and shutter speed, according to what you are photographing. They may also adjust focus, white balance, and other settings.

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