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[ATM] Small Design with Low Zonal Error

75 mm f/8 (600 mm f.l.) Achromat:

    http://users.rcn.com/rflrs/Ptz09-99x.atm   ATMOS input file
    http://users.rcn.com/rflrs/Ptz09-99x.len   OSLO input file
    http://users.rcn.com/rflrs/Ptz09-99x.txt   TEXT prescription
    http://users.rcn.com/rflrs/Ptz09-99x.zmx   ZEMAX input file

In spite of the geometrical constraints, it has relatively low
zonal error -- c. 3.5 microns, giving lambda/450 P-V for system
testing in e light.  The Visual Strehl ends up being 0.7822 in
the center and 0.7775 at edge of the four degree (42 mm) flat
field.

The first lens of the second doublet is reduced in size so that
both are 50 mm diameter.  If you can get 48 mm aperture out of
that, the vignetting at the field edge is less than 7%.
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