A-DEP: Auto Depth of Field Mode
The A-DEP, or Auto Depth of Field, setting is on the Creative zone side of the dial, but in my opinion it should be over in the Basic zone. The mode works this way: As you depress the shutter release button to focus on your subject, the camera will use the other focus points to measure the distance of the other objects in the viewfinder. Then, it will determine what the appropriate aperture setting should be to render all of the objects in focus (Figure 4.14). The only way to adjust your exposure is to change the ISO. There will be more discussion of the A-DEP mode and how to use it in Chapter 7.
Figure 4.14 Landscapes with subjects that are at differing distances could benefit from the A-DEP mode.