Re: [ATM] Simple Petzval Design

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

Richard F.L.R. Snashall wrote:
>
> Again, this is corrected for spherical aberration, coma and 
> astigmatism.  Both lateral
> and longitudinal color are quadratic over C-F.  The longitudinal C-F 
> crossover is
> at the 70% zone.
Maybe these aren't as rare as I would have thought (200 mm f/7.5):


    http://users.rcn.com/rflrs/Ptz08-53x.atm   ATMOS input file
    http://users.rcn.com/rflrs/Ptz08-53x.len   OSLO input file
    http://users.rcn.com/rflrs/Ptz08-53x.txt   TEXT prescription
    http://users.rcn.com/rflrs/Ptz08-53x.zmx   ZEMAX input file


I haven't figured out why this one seems to have slightly better
longitudinal color, though.
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