Fig. 6.9. Through-focus spot diagrams for misahgned Ritchey-Chretien telescope with shifted and
tihed focal surface. Scale bar on upper left is
1
arc-sec long. See the discussion following Eq. (6.3.19).
that are largest at the edge of the usable field. McLeod (1996) describes how
observations of the astigmatic images at the edge of the field can be used t ...
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