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Re: [ATM] All Spherical Telescopes

Richard F.L.R. Snashall wrote:

>
>
>I started with a simple f/10 that had an interior focus 2/3 of the
>way back to the primary and a secondary sized under 1/4 size.  I
>added the relay elements in the path, ending up with f/-12.  It
>  
>
Correction. f/-15

>doesn't quite get to diffraction limited.  I wonder if some other
>tweek would push it over. I like the fact that the lens pairs are
>mirrors of each other (except the spacing).
>  
>
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