Selecting an autofocus point

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When you shoot in any of the fully automatic exposure modes (Full Auto, Portrait, Landscape, and so on) as well as in A-DEP mode, all seven of your camera's autofocus points are active. That means that the camera's autofocus-ing system looks at all the points when trying to establish focus. Typically, the camera sets focus on the point that falls over the object closest to the lens. If that focusing decision doesn't suit your needs, you have two options:

✓ Set the camera to P, Tv, Av, or M exposure mode. In those modes, you can tell the camera to base focus on a specific autofocus point.

Chapter 1 explains how to adjust focus manually. If you want to use autofocus-ing and specify an autofocus point, the following steps spell out the process.

vrtHBE# These steps assume that you are not shooting in Live View mode. I explain the intricacies of Live View autofocusing a little later in this chapter, in the section cleverly named "Autofocusing in Live View Mode." However, some of the autofocusing concepts involved in normal shooting also come into play for Live View autofocusing, so familiarize yourself with these steps before you jump to that discussion.

Again, you can specify an autofocus point only in these exposure modes.

2. Press and release the AF Point Selection button, highlighted in Figure 6-3.

When you do, you see the AF Point Selection screen on the monitor. In Automatic AF Point Selection mode, all the autofocus points appear in color, as in Figure 6-4. In Manual AF Point Selection mode, only one point is selected and appears in color, as shown in Figure 6-5. In the figure, the center AF point is selected.

You can check the current mode by looking through the viewfinder, too. When you press and release the AF Point Selection button, all seven autofocus points turn red if you're in Automatic AF Point Selection mode. A single point turns red if you're in Manual AF Point Selection mode.

AF Point Selection button

AF Point Selection button

Where The Button Rebel
Figure 6-3: Press and release the AF Point Selection button to select an autofocus point.

3. To choose a single autofocus point, set the camera to Manual AF Point Selection mode.

You can do this in two ways:

• Rotate the Main dial. This option is easiest when your eye is up to the viewfinder.

• Press the Set button. Pressing the button toggles you between Automatic AF Point Selection and Manual AF Point Selection with the center point activated.

4. Specify which AF Point you want to use.

You can either rotate the Main dial or press the cross keys to select a point. When all autofocus points again turn red, you've cycled back to automatic AF Point Selection mode. Rotate the dial or press a cross key to switch back to single-point selection.

Auto Focus Point
Figure 6-4: In Automatic mode, all seven autofocus points are active.

Figure 6-5: You also can base autofocus on a single point; here, the center point is selected.

That's all there is to it — after you select the autofocus point, just frame your shot so that your subject falls under that point and then press the shutter button halfway to focus.

h If you want the benefits of autofocus but find it bothersome to have to worry about selecting an autofocus point, try this approach: Set the camera to ■ Manual AF Point Selection and select the center point as the active point.

Now the camera will always set focus based on whatever is at the center of the frame. If you want your subject to appear off-center, you still can: Just frame the picture initially so that the subject is centered, depress the shutter button halfway to establish focus, and then reframe the image before pressing the shutter button the rest of the way.

Figure 6-5: You also can base autofocus on a single point; here, the center point is selected.

Do be careful about exposure if you use this technique, however. If the exposure metering mode is set to either Partial or Center-Weighted Average metering and you reframe the image so that your subject isn't at the center of the frame, exposure may be off. To compensate, you may need to lock exposure (using the AE Lock button) before you reframe. In Evaluative metering mode, this issue shouldn't be a big problem because exposure is based on the entire frame. Chapter 5 provides details about metering modes, autoexposure lock, and other exposure issues.

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Digital Camera and Digital Photography

Digital Camera and Digital Photography

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    How to set auto focus points in canon 1000d?
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