[ATM] Petzval Design

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

Of the "well-known" glasses, Schott N-K5 and Schott F2 have the
same CTE (to 0.1 ppm/deg.C).  That is important if you want to
mate them in a larger design (290 mm f/7.5):

    http://users.rcn.com/rflrs/Ptz09-49x.atm   ATMOS input file
    http://users.rcn.com/rflrs/Ptz09-49x.len   OSLO input file
    http://users.rcn.com/rflrs/Ptz09-49x.txt   TEXT prescription
    http://users.rcn.com/rflrs/Ptz09-49x.zmx   ZEMAX input file

In this design, I allowed deviation from simple geometry in the
smaller lenses (if you can call 180 mm diameter "small") to both
make the field flat and to minimize the zonal error at the e-line.
I also constrained the design to use only those two glass types.
Minimizing the zonal error allows the system to be tested using
that green wavelength.

The Visual Strehl ends up at 0.5296.
_______________________________________________
ATM mailing list http://www.atmlist.net/