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Canon® EOS Rebel XSi/450D Guide to Digital SLR Photography by David D. Busch

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Choosing a Metering Method

The XSi has four different schemes for evaluating the light received by its exposure sensors. You can choose among them by pressing the Metering Mode button (up cross key) and rotating the Main dial until the mode you want is selected.

  • Evaluative. The XSi slices up the frame into 35 different zones, shown in Figure 4.8 (the LCD icon is shown in the upper-left corner). The camera evaluates the measurements, paying special attention to the metering zones that indicate sharp focus, to make an educated guess about what kind of picture you’re taking, based on examination of thousands of different real-world photos. For example, if the top sections of a picture are much lighter than the bottom portions, the algorithm can ...

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