Re: [ATM] Constraints on design

["matt" <electro_optic@bellsouth.net>]

Richard,
I would be interested too in your prescription as a starting point and
comparison with my goal.
I found references to professional telescopes 24" aperture and f/6 overall
with Klevtsov style correctors , so it is possible to reach a good design
with it .
best regards,
matt tudor


-----Original Message-----
From: Richard F.L.R. Snashall <rflrs@rcn.com>
To: ATM List <atm@atmlist.net>
Date: Sunday, May 01, 2005 8:53 AM
Subject: Re: [ATM] Constraints on design


>matt wrote:
>
>> Richard,
>>
>> If your goal is a large compact scope based on a very fast spherical
>> primary, have you considered a Klevtsov style scope? It has spherical
>> primary and secondary :
>> http://www.telescopes.ru/articles/article1.phtml
>>
>At f/10.1, by adding a compensating [triplet] lens at the point the
>light passes through the primary (i.e. mounted to the primary), I
>was able to get the SCT to be adequate for wide band (i-t) imaging.
>Both the primary and the [25% diameter] secondary are spherical.
>
>That was something I really didn't expect to find.  The only real
>question I found with it was the kind I quite often find with
>triplets; two glasses are close in index/Abbe so the solution may
>be strongly dependent on glass quality.
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