[ATM] Dual-Use Refractor

[Richard F.L.R. Snashall]

Richard F.L.R. Snashall wrote:
>
> The second design is at:
>
>     http://users.rcn.com/rflrs/Ptz07-55x.atm
>     http://users.rcn.com/rflrs/Ptz07-55x.len
>     http://users.rcn.com/rflrs/Ptz07-55x.txt
>     http://users.rcn.com/rflrs/Ptz07-55x.zmx
>
> Warning to ATMOS and OSLO users:  There are more than 10 surfaces.  In
> addition, my versions of ATMOS and OSLO do not have the glass N-SF11.
> I inserted that glass as a direct specification.  This could have some
> impact on certain analysis features.
Less exotic glass selection:

    http://users.rcn.com/rflrs/Ptz07-59x.atm
    http://users.rcn.com/rflrs/Ptz07-59x.len
    http://users.rcn.com/rflrs/Ptz07-59x.txt
    http://users.rcn.com/rflrs/Ptz07-59x.zmx


The Visual Strehl is slightly better, at 0.981;-)

The chromatic focal shift has lost its S shape -- now it's a W
over the 390..780 nm range.

I also optimized for a wider correction of astigmatism.