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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