The amount of DOF is an artistic choice. As I'm reading this thread, I'm watching TV and looking at the DOF. The show varies from a slight blur to twice as strong as what Ghostship used in the same scene. It also changed from one person to the other. One of the commercials also had quite a strong DOF. You couldn't tell any details.

There are multiple reasons for using DOF. It can add depth, add emphasis, change focus, hide imperfections in the background, or just look pretty.

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