V12

= 3.46

Third order Spherical Aberration (Si) alone

ksip4

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

focus)

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