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[ATM] Petzval

Yup... another Petzval -- 290 mm f/7.5.  Not the best, but still
has a Visual Strehl of > 0.9 at the field edge (21 mm; > 1/2 degree)
using the cheaper Ohara fluorcrown.

    http://users.rcn.com/rflrs/Ptz04-29x.atm
    http://users.rcn.com/rflrs/Ptz04-29x.len
    http://users.rcn.com/rflrs/Ptz04-29x.txt
    http://users.rcn.com/rflrs/Ptz04-29x.zmx

Assuming, of course, that you have the wherewithall to obtain
that size piece of good enough glass.
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