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in which 1

In the Gregory case, (6s2)c; = -0.36000, while the second term in (3.138) gives with f = —1 and m2 = +4 in the normalized case of Table 3.2 the value —2.27556. The total gives

(bs2)SP,Greg = —2.63556 , a modest hyperbola, a much easier form to test and make than the convex oblate spheroid of the equivalent Cassegrain form.

Since E St =0, the field coma of the SP form is given from Eq. (3.60) or Table 3.5 by

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