The remaining third-order aberration to be considered is that of curvature of
field. As noted in Chapter 4 this aberration does not affect the image quaHty, but
given the usual case of a flat detector can adversely affect the image definition
over an extended field. For the Schmidt camera, for example, the focal surface has
a radius of curvature equal to the camera focal length. Matching the detector to
the focal surface requires either deforming it to the proper radius or using another
optical element to "flatten" the field. The former method is used with most large
Schmidt telescopes by bendin ...
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