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Re: [ATM] Interesting Doublet

Hi,

Sort of related to this : does anyone know of a source (for
US folks) for Russian and/or Chinese optical glass that does
not involve ocean-going-freighter-size quantities?

Matt

> On sci.astro.amateur news group, Valery Deryuzhin
> suggested a combination of the Russian glass OF6 and
> Fluorite as a good combination for a doublet.  I got the
> glass information for OF6 from the glassbank site:
>
>     http://glassbank.ifmo.ru
>
> and computed the Sellmeier coefficients:
>
> B1 = 1.22448703  C1 =  0.00637798735
> B2 = 0.294661626 C2 =  0.0284543486
> B3 = 1.0050109   C3 = 72.1638435
>
> and plugged them in.  I got:
>
>     http://users.rcn.com/rflrs/d06-48x.len
>     http://users.rcn.com/rflrs/d06-48x.txt
>
> The text file has the direct specification for OF6 indices
> that I put into the OSLO prescription.
>
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