Example
As an example, for a 50 mm lens at using a circle of confusion of 0.03 mm, which is a value typically used in 35 mm photography, the hyperfocal distance according to Definition 1,
If the lens is focused at a distance of 10.5 m, then everything from half that distance (5.2 m) to infinity will be acceptably sharp in our photograph. With the formula for the Definition 2, the result is 10417 mm, a difference of 0.48%.
Note that the second definition assumes that the depth of field is symmetric around H (which is roughly correct for normal lenses) and therefore assumes a setting in which only half the depth of field is utilized (i.e., for a lens focused at infinity, the depth of field is 10.4 m to infinity).
Read more about this topic: Hyperfocal Distance
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