Patent ID: 8415601

Claim:
Imaging optics comprising: at least one circularly symmetric optical element having a surface sag described by: sag ⁡ ( r ) = ∑ i = 1 6 ⁢ a i ⁢ r 2 ⁢ i + γ ⁢ ⁢ ∑ j = 1 10 ⁢ b j ⁢ d p j where d = [ r : 0 < r < 0.70418 0.70418 : otherwise , ⁢ ⁢ a i = 1 : 6 = [ - 4.65 ⁢ e - 3 - 2.90 ⁢ e - 2 - 4.16 ⁢ e - 1 - 1.47 2.02 - 9.62 ] , ⁢ b j = 1 : 10 = [ - 2.18 ⁢ ⁢ 2.55 ⁢ ⁢ 2.59 ⁢ ⁢ 3.98 ⁢ - ⁢ 6.84 ⁢ ⁢ 4.07 ⁢ ⁢ 7.33 ⁢ - ⁢ 4.25 ⁢ ⁢ 7.68 ⁢ - 36.54 ] , ⁢ p j = 1 : 10 = [ 1 2 3 4 5 6 7 8 9 20.08546 ] , and ⁢ ⁢ γ = 5.401 ⁢ e - 5 .