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Canon EOS 40D Guide to Digital Photography by David D. Busch

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Going Topside

The top surface of the Canon EOS 40D has its own set of frequently accessed controls. The three of them just forward of the status LCD panel have dual functions and are marked with hyphenated labels. Press the relevant button (you don’t need to hold it down) and then rotate the Main Dial to choose the left function of the pair, such as Metering Mode, Autofocus, or ISO, and the Quick Control Dial to select the right function, such as white balance, drive mode, or flash exposure compensation. The settings you make will be indicated in the LCD status panel, which is described in the section that follows this one. The key controls, shown in Figure 2.12, are as follows:

Figure 2.12.

  • Mode Dial. Rotate this dial ...

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