[ATM] Another Solution

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

With some [probably] well-known glass types (72 mm f/5)

    http://users.rcn.com/rflrs/Ptz09-40x.atm   ATMOS input file
    http://users.rcn.com/rflrs/Ptz09-40x.len   OSLO input file
    http://users.rcn.com/rflrs/Ptz09-40x.txt   TEXT prescription
    http://users.rcn.com/rflrs/Ptz09-40x.zmx   ZEMAX input file

The zonal correction doesn't seem good, but the Visual Strehl
is higher than I would have suspected.  Maybe it the N-SF1 impact.

Rather than go for a perfectly flat field, I chose a close
solution that had the additional geometry constraint.  That
means that only the one radius should be grievous at all and the
field curvature still only amounts to about 6 microns for the
full 42 mm field (6-2/3 degrees).
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