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With the geometry and normalization of Tables 3.2 and 3.3

With the geometry and normalization of Tables 3.2 and 3.3

SP,0

Cass the second term being the change compared with the classical telescope. Apart from the huge coma, we see there is also a serious increase in astigmatism.

In the afocal case, Eq. (3.144) reduces with the usual substitutions from (2.55) and (2.72) to the non-singular form

Afoc a result which can also be derived at once from Table 3.6 and Eq. (3.137). Also, from (2.72),

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