#photography
Let s be the distance at which the camera is focused (the "subject distance"). When s is large in comparison with the lens focal length, the distance DN from the camera to the near limit of DOF and the distance DF from the camera to the far limit of DOF are (approximately):
\(\large D_N\approx\frac{Hs}{H+s}\)
and
\(D_F\approx\frac{Hs}{H-s}\) for s<H
The depth of field DF - DN is
\(\large DOF\approx\frac{2Hs^2}{H^2-s^2}\)
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Depth of field - Wikipedia, the free encyclopediaities discussed below.
Hyperfocal distance[edit]
Let be the lens focal length, be the lens f -number, and be the circle of confusion for a given image format. The hyperfocal distance is given by
Moderate-to-large distances[edit]
<span>Let be the distance at which the camera is focused (the "subject distance"). When is large in comparison with the lens focal length, the distance from the camera to the near limit of DOF and the distance from the camera to the far limit of DOF are
and
The depth of field is
Substituting for and rearranging, DOF can be expressed as
Thus, for a given image format, depth of field is determined by three factors: the focal length of the lens, the f -number Summary
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