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[ATM] New Glass Type

Schott's newest catalog release contains a new glass type N-KzFS8
(720347.320).  Just about where Ohara S-NBH8 is.  About 6 times
the cost of N-BK7.  Quite robust.  dPgf about a fifth of N-KzFS4 et.al.


Wonder what it would do with N-SK4 (not as robust)...

100 mm f/15 Doublet
VS: 0.8711 at 0.138 mm
Min: 542.991 nm

Surf     Radius  Thickness    Glass   Diameter

 STO   Infinity  -1.658548                 100
   2   754.5007         10     N-SK4       105
   3  -754.5007        7.5   N-KZFS8       105
   4     209410   1488.099                 105  about 6.6 microns concave
 IMA  -896.1581                       26.01139
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