Selecting an Autofocus Exposure Zone Manually

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If you're using P, Av, Tv, or M shooting modes and Evaluative Metering, you can select the autofocus zone manually (and thus the zone linked to the metering system). As I mentioned in Chapter 1, the EOS 40D uses nine different focus points to calculate correct focus. In A-DEP, or any of the Basic Zone shooting modes, the focus point is selected automatically by the camera. In the other Creative Zone modes, you can allow the camera to select the focus point automatically, or you can specify which focus point should be used.

There are several methods to set the focus point manually. You can press the AF point selection button on the back of the camera (with the icon representing focus points), look through the viewfinder, and use the multi-controller knob (to the right and below the viewfinder window) to move the focus point to the zone you want to use, as shown in Figure 4.10. Press the multi-controller knob straight up or down, and the top or bottom focus points are selected. To the left or right, and the side points are selected. Movements to the two o'clock, four o'clock, seven o'clock, or ten o'clock positions choose the in-between focus sensors. Press the multi-controller knob in, and the center focus point becomes active.

Center Focal Point Man

Figure 4.10

Select an autofocus point manually, and the 40D's exposure meter will link to that point in Evaluative mode.

Figure 4.10

Select an autofocus point manually, and the 40D's exposure meter will link to that point in Evaluative mode.

You can also choose a focus point by pressing the AF point selection button and then rotating the Main Dial. The focus point will cycle among the edge points counterclockwise (if you turn the Main Dial to the left) or clockwise (if you spin the Main Dial to the right), ending/starting with the center focus point/all nine focus points. You can also use the Quick Control Dial to adjust focus points.

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Digital Camera and Digital Photography

Digital Camera and Digital Photography

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