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[[File:MTF example graph.jpg|thumb|right|310px|The '''MTF''' data versus spatial frequency is normalized by fitting a sixth order polynomial to it, making a smooth curve. The 50% cut-off frequency is determined and the corresponding '''spatial frequency''' is found, yielding the approximate position of '''best focus'''.]]
The Fourier transform of the line spread function (LSF) can not be determined analytically by the following equations{{Citation needed|reason=Many functions have analytical Fourier Transforms|date=
:<math>\operatorname{MTF} = \mathcal{F} \left[ \operatorname{LSF}\right] \qquad \qquad \operatorname{MTF}= \int f(x) e^{-i 2 \pi\, x s}\, dx</math>
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