Re: [ATM] Schmidt Cassegrain

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

Michael Peck wrote:

> At 10:50 1/9/05, Richard F.L.R. Snashall wrote:
>
>
>>
>
> This makes me wonder what Meade is up to with their new line of 
> "Ritchey-Chretien" telescopes besides maybe some creative marketing. 
> My optical design skills are pretty rusty and OSLO's optimization 
> routines don't always work, but the best I could come up with starting 
> from an RC design and adding a thin plate at the front was a very 
> weakly aspheric plate that did some aberration balancing at the cost 
> of adding some spherical aberration. Field curvature obviously can't 
> be significantly affected with a Schmidt type plate (can it?) so they 
> must have taken some creative license with that spot diagram. Assuming 
> typical commercial SCT parameters field curvature has to be 
> significant in these things. 

Look at my design at just the e-line as a comparison to the Meade
diagram.  To me, it tells me something significant about their
design.

>
>
> Mike Peck
>
>

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