hyperfocal distance

Definition: Distance from the lens (at a given aperture) to a subject in focus such that the far depth of field extends to infinity. * This is approximately equal to the nearest point at which an object appears sharp when the lens is focused at infinity, at a given aperture. * In practice, it is regarded as that focused distance which gives the greatest extent of depth of field and increases with f/number.
To calculate:
divide the square of the focal length (mm) by the f/number multiplied by the diameter of the circle of confusion (mm). To be precise, you also add the focal length to the result, but that is usually insignificant compared to the hyperfocal distance.

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