Third order Spherical Aberration (Si) alone
445 kSi (l - S2 - 2e4 - S6 + e8)
V11.25 = 3.35
Si + d (optimum
kdp2 + ksip4
1(1 - e2)2 + -d 6S1 (1 e2 e4 + e6)
/ 180 V 16
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