Re: [ATM] All Spherical Telescopes

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

Delyan Toshev wrote:

>
>Bob, this sounds logical, but in fact they (Clave, the company) claim 
>quite the contrary - that this is quite new design made possible after 
>they wrote custom software, which performed some "magical" optimizations 
>:-) Please, excuse my irony, but the companies today are quite obsessed 
>with secrecy and actually prefer publicly perceived view of their 
>technology as "magical" devices :-)
>Now, Clave is (or was?) very serious company, but I have not found any 
>reasoning for their variant of relay corrector lens. I can understand if 
>such lens are being developed for large aperture, but 166mm and 254mm, 
>even 460mm are hardly called large apertures.
>
Actually, 6 lenses doesn't seem to be far away.  From the "upgrade" above,
I slapped a couple of N-F2 elements inside and forced cementing.  It didn't
lose too much from the air-spaced doublet setup -- Visual Strehl still just
above 0.9 at the field edge.  It reduces the number of air-glass surfaces
to 4.
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