Re: [ATM] Simple Petzval Design

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

Richard F.L.R. Snashall wrote:
> A 150 mm f/7.5 Petzval design:
>
>     http://users.rcn.com/rflrs/Ptz07-79x.atm
>     http://users.rcn.com/rflrs/Ptz07-79x.len
>     http://users.rcn.com/rflrs/Ptz07-79x.txt
>     http://users.rcn.com/rflrs/Ptz07-79x.zmx
>
> Only four air-glass surfaces.
Then, again, maybe we can go [almost] back to plan A:

    http://users.rcn.com/rflrs/Ptz07-99x.atm
    http://users.rcn.com/rflrs/Ptz07-99x.len
    http://users.rcn.com/rflrs/Ptz07-99x.txt
    http://users.rcn.com/rflrs/Ptz07-99x.zmx


The second doublet is larger than would be wanted and the
glasses in the second doublet don't match CTEs quite as
much as in the first, but at least all the glasses should
be well known.  The color correction in this 290 mm f/7.5
is a bit red for my preference (C-F cross at 64% zone),
but may some like it that way.
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