Understanding Focus by Digital Photo Secrets: "What is focus? In photography, it’s practically married to sharpness. An image that is completely sharp is said to be in-focus. An image that’s completely blurry is said to be unfocused. The same metaphor applies to your mind. When you concentrate, your mind is sharp. You are focused. When you’re confused, you lack focus. As you are about to learn, you can use focus to direct your viewer’s attention to the most important parts of a scene. Here’s how."
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