Definitions for "Hyperfocal Distance"
The distance from the camera to the nearest plane of sharpest focus when the far plane of the depth of field is at infinity.
n. The distance at which you focus the lens for a landscape photograph to give maximum depth-of-field from infinity to a near point close to the camera. The hyperfocal distance depends on the focal length, aperture, and the size of the circle of confusion that the photographer decides on. One of the most handy tools for a landscape photographer is a hyperfocal distance calculator, a printed pin wheel type calculator that covers the photographers landscape lenses. _______________________________________________________
Using the depth of field principle, as a lens is gradually focused to farther subject distances, a point will eventually be reached where the far limit of the rear depth of field will be equivalent to "infinity." The shooting distance at this point, i.e., the closest shooting distance at which "infinity" falls within the depth of field, is called the hyperfocal distance. The hyperfocal distance can be determined as follows: Hyperfocal distance = f2 focal length F number minimum circle of confusion diameter • Thus, by presetting the lens to the hyperfocal distance, the depth of field will extend from a distance equal to half the hyperfocal distance to infinity. This method is useful for presetting a large depth of field and taking snapshots without having to worry about adjusting the lens focus, especially when using a wide-angle lens. (For example, when the EF 24mm is set to f/11and the shooting distance is set to the hyperfocal distance of approximately 1.5m/4.9ft, all subjects within a range of approximately 70cm/2.3ft from the camera to infinity will be in focus.)