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Korsch gives two examples of the application of his formulae above to two three-mirror geometries, shown in Fig. 3.72 (a) and (b). The application of the Korsch formulae to his system (a) is shown in Case 9 of Tables 3.2 and 3.3 for the usual normalization with y 1 = 1 and f/ = -1. The set-up data for the Korsch proposal with f/4.5 are:

m2 = -10 (negative for Cassegrain)

Ra = +0.25 (positive for Cassegrain)

Spherical Aberration Examples

by Korsch

Fig. 3.72. Two 3-mirror anastigmatic, flat-field solutions proposed (1972): (a) single-axis system, (b) 2-axis system by Korsch

Then, from (3.318), m3 = -0.150 , an exact value differing from the value -0.149 given by Korsch. This small rounding error has a significant effect on the remaining values deduced from the formulae, which therefore differ somewhat from those given by Korsch.

Table 3.18. Data of the system of Fig. 3.72(a), adapted from Korsch [3.73]

Ni

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