Here is a summary of key points made in this chapter.

■ Focus, out of focus, soft focus, hard focus, and blur all have their role in photography. The trick is to be able to predict and control what kind of effect you want your pictures to have.

■ Understanding depth of field is important in understanding how to make certain that the areas and subjects in a picture you care about will be in sharp focus, even when they are at different distances from the lens.

■ There are several different kinds of autofocus. Knowing what they are and how to use them can help you take better, more dramatic pictures.

■ There will be occasions when autofocus won't work. That's when you can use manual mode or other tricks to get a sharp picture.

■ AF Assist is a useful feature for helping your camera's autofocus to work in low-light situations, but it should be used judiciously.

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