Curvature of field

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Curvature of field

(Science: microscopy) a property of lens that causes the image of a plane to be focused into a curved surface instead of a plane.

The image plane formed by a single lens is naturally curved. While one part of the field will be in good focus, the rest will need refocusing to be sharp. While the eye may partially correct for this, a camera lens will not, and the final image as photographed will not be in perfect focus over the entire image plane.