S J

f7+di L

showing that the strength of the plate is approximately proportional to g2. In both the RC and aplanatic Gregory cases the plate is negative like a Schmidt plate, the opposite form from a Gascoigne plate in the PF.

Since the contribution of the aplanatic system to the spherical aberration and coma is zero, we have from (4.31)

f7+d1 L

f -

(f7 + d-

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