Fig. 3.44. Spot-diagrams for a Linfoot monocentric Schmidt-Cassegrain with spherical mirrors and a singlet (non-achromatic) corrector plate (400 mm, f/3.0 - f/6.0)

We first define the following basic parameters:

- Corrector plate at prime focus giving spi = +f' = —0.2

- Primary defined as spherical, therefore bs i =0

- Cassegrain image f'/10 behind pole of primary, therefore b = 0.1

The system is shown in Fig. 3.45. We derive the remaining parameters as follows:

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