There are two methods:
1.With the eye control. turn the command dial on the left of the camera body, to DEP. Focus by looking at a foreground with one focus point, press the shutter buttom, this DEP 1. Focus by looking at the background with another focus point, press the shutter button halfway. Depending on your light exposure (program mode), you may not see much of a difference in the depth of field.
This is also done without eye control, but with one only one focus point.
2. CF4/setting no.2. Go to your command dial, turn the dial to CF. On the main dial on the right of the camera, turn til you see CF4 on the LCD panel. Select number 2 by pressing the exposure lock button/CF on the back of the camera. Turn your command dial to a photo mode, or choose a small aperture in AV or manual mode (be sure shutter speed is good in manual mode), compose the shot, press half way on the shutter button, and press the expose lock/CF button. You should see your depth-of-view very well.
The newer Canon models have thier preview depth- of-view button built near the lens release button. Thank God! I hope this helps.
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