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This page looks like it has been lifted from a larger article. For example, the following sentence appears "The OTF accounts for [[aberration in optical systems|aberration]], which the limiting frequency expression above does not." but there is no previous refrence to a "limiting frequency expression". Please explain what this is.
The '''Optical Transfer Function''' (OTF) describes the spatial (angular) variation as a function of [[spatial frequency|spatial (angular) frequency]]. When the image is projected onto a flat plane, such as photographic film or a solid state detector, spatial frequency is the preferred ___domain, but when the image is referred to the lens alone, angular frequency is preferred. OTF may be broken down into the magnitude and phase components as follows:
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