An Afocal-system OTF Test Standard

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Abstract
Several standard test lenses for evaluating the accuracy of OTF measuring equipment have been described in the literature. However, these are not generally suitable for evaluating the equipment and test procedures used for afocal systems which differ from those used with normal lenses in several significant ways. A special afocal system in the form of a straight-through telescope has been designed and built for this purpose. The paper describes the design and construction of this telescope and compares the calculated and experimentally measured values for the MTF of the system. A particular feature of the MTF calculations is that they have been carried out, not only for the usual radial and tangential azimuths, but also for several intermediate azimuths. Thus it has been possible to determine the value of a range of different MTF-based criteria which relate to measuring equipment where the MTF is measured at a single spatial frequency in all azimuths.

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