F1 f2 d1

3.8.1.2 Change in spherical aberration S/. A very important despace effect is the change of spherical aberration in the axial image (and therefore uniformly over the whole field) when d1 is varied and the image shifts according to (3.398). The third order contribution (Sj )2 of the secondary is easily derived from the recursion formulae (3.336) and (3.337) or directly from (3.39) and (2.72) as

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