Re: [ATM] ATM: simplest ever unobstructed scope

["David Harbour" <stainless_steel@suddenlink.net>]

Thanks, Bob-

I thought that would about sum it up.

A lot have checked in to tell me how long Roger Tuthill has been, well, in 
the "Noumenal world" now; curiously, no one has mentioned anything about 
Sherman Schulz (Schultz?) who was often showcased in Sky and Tel about his 
activities at his atm-ing class at McAlester college, in one of the twin 
cities. Would you know, Bob? I corresponded with him in the age of 
typewriters, before PCs, and I suspect he may now be gone, too. Someone who 
might know might check in with the info, or let me know off-list.

Thanks, Bob-

R-101

----- Original Message ----- 
From: "Bob May" <rmay@nethere.com>
To: <atm@atmlist.net>
Sent: Monday, April 28, 2008 11:49 PM
Subject: Re: [ATM] ATM: simplest ever unobstructed scope


> There are all kinds of odd corrector designs for subdiameter
> correctors.  Some handle spherial mirrors while others handle
> other shapes up to and including hyperboloids.  I've got a windoz
> program on my site that helps develop wide angle (read
> photographic) telescopes suitable for photographic uses.  Bob
> Lind did the origial software and I just adapted it to windoz
> with some cute graphics.  Off axis designs can be obtained by
> doing the full on-axis scope and then just doing the part you are
> interested in.
> Bob May
>
> rmay at nethere.com
> http: slash /nav.to slash bobmay
> http: slash /bobmay dot astronomy.net
>
> ----- Original Message -----
> From: David Harbour <stainless_steel@suddenlink.net>
> To: ATM list <atm@atmlist.net>
> Sent: Monday, April 28, 2008 4:00 PM
> Subject: [ATM] ATM: simplest ever unobstructed scope
>
>
>> All:
>>
>> I haven't read anyone posting about the virtues of the tilted
> component
>> system that is essentially a Newtonian, with a tilted primary
> mirror, and
>> two simple menisci just downstream from the diagonal to correct
> for the
>> induced astig. and coma. I have seen versions of this several
> times in Sky
>> and Tel, over the decades. Surely someone else has.
>>
>> I corresponded with Sherman Shultz (with a 75 year old
> typewriter, ink on
>> paper, many decades ago) about curing the astig. in his 20, or
> 24" Newt
>> (Yoke mounted, ala Hooker 100") at McAlester College; he
> favored a tilted
>> zero power meniscus, and I favored a little warping harness for
> the
>> diagonal. What ever happened to Sherman Schultz?
>>
>> What ever happened to Roger Tuthill, who built that neat
> Maksutov Newtonian,
>> with tilted components, as an unobstructed Newtonian; why is he
> not on our
>> list of elite atms? Was he ever? And I have gotten to thinking
> about the
>> other pioneers from my stacks of now long gone S & T mags- was
> Arthur
>> Leonard ever on our list? Where is everybody?
>>
>> Also, If I was going to try an unobstructed instrument with
> tilted
>> components, I think I would go for one of those designs I saw
> that were
>> reported to have functioned acceptably- the two or three
> designs I saw as
>> Newts with a little meniscus, or two, tilted, each, just before
> the diagonal
>> (out of harm's way of entering light). Does anyone else think
> that this idea
>> bears investigating?
>>
>> A long time ago, I asked the great Thomas Cave if I should buy
> a largish
>> Cassegrain (I talked to him on the phone, when he was still
> advertising) he
>> said I could make a Newt into a kind of Cass. just by buying a
> good Barlow
>> lens, and for far less dough. I did just that; many, many years
> (decades)
>> ago. I understand he has passed....
>>
>> R-101
>>
>> P.S. How did the Herschels ever cure the astig. and coma, that
> they must
>> have had in horrendous amounts, in their big scopes? Does
> anyone know? There
>> are some interesting "legends" about the Herschels-
>>
>>
>> _______________________________________________
>> ATM mailing list http://www.atmlist.net/
>>
>
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> 


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