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Re: [ATM] F5 Achromat Design Help

However, for our daily dose of sacrilege:

Surf      Radius   Thickness    Glass
 STO    Infinity   -4.982462
   2      334.28        18.5    N-BK7
   3    -224.739       3.632
   4    -221.434           6       F2
   5    -1042.78    577.9452
   6   -208.8617      0.0044
 IMA      -154.1

The minimum focus here is at 522.499 nm, making the F-line mate,
longitudinally, with a wavelength of about 618 nm.  The central
visual Strehl is 0.6080 with a drop off of about 2.2 magnitudes
at 10.4 mm from the center.
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