plane-parallel plate is replaced by a meniscus lens. Except for the wedge added to
make each lens a prism, the curved surfaces of these lenses have a common center
of curvature at the on-axis focus of the telescope. The interested reader should
consult the article by Wynne for further details. A design of an ADC in an//1.6
beam in a wide-field 3-mirror telescope has been given by Willstrop (1987).
Finally, it is important to note that the differential dispersion produced by an
ADC is not generally a mirror image of that due to the atmosphere. As a
consequence the exact compensation at a pair of wavelengths may leave residua ...
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