Infinity focus

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In optics and photography, infinity focus is the state where a lens or other optical device forms an image of an object an infinite distance away. This corresponds to the point of focus for parallel rays. The image is formed at the focal point of the lens.

In practice, not all photographic lenses are capable of achieving infinity focus. A lens used with an adaptor for close-up focusing, for example, may not be able to focus to infinity.