# 14. Are there some simpler approximate formulas for depth of field?

## Description

This article is from the
Photographic Lenses FAQ, by David Jacobson with numerous
contributions by others.

# 14. Are there some simpler approximate formulas for depth of field?

Yes. When the object distance is small with respect to the
hyperfocal distance, the front and rear depth of field are almost
equal and depend only on the magnification and effective f-stop and
the following approximate formulas can be used.

frontdepth = reardepth = Ne*c/M^2
frontdepth = reardepth = So/hr

In non-macro situations Ne is the same as the marked f-number.

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