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As I understand, if we want to focus on an object, we would place our back plane so that the image plane of the object is aligned with the back plane. This would mean that objects further from this image would take up a disproportionate amount of space on the film, and so, when the sample rays are averaged, they would look blurry, because we are averaging samples across a wide range. This range is the "circle of confusion" for that object. Is this correct?