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Re: [ATM] Doublet Designs

Richard F.L.R. Snashall wrote:

> I used the GSUM tool to design a number of air-space doublets
> which were corrected at 555 nm.  They are presented at:
>
>    http://users.rcn.com/rflrs/doublet_spectrum.htm
>
I added an overlaid plot of the focal shift of the nine designs.  I 
noticed that
the designs almost [but not quite] go up to the B-F correction mentioned
on Roger's page.  Did they really correct that red back then?
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