Re: [ATM] RE: 25" mirror possibilities

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

Tom, you are correct. I was trying to collect any info available on the
internet about aplanatic Gregorian scopes and came out with nothing . Except
for a few references to some of the very largest professional telescopes
which are or could be configured as such, but these references are in the
form of press releases and not desiggn details.
There is no information available in other words, nobody does it,  therefore
it does qualify as out of the box .

best regards,
matt tudor

-----Original Message-----
From: lou krajci <loukrajci@comcast.net>
To: atm@atmlist.net <atm@atmlist.net>
Date: Tuesday, November 23, 2004 3:58 PM
Subject: [ATM] RE: 25" mirror possibilities


>>From: Michael Peck <mpeck1@ix.netcom.com>
>
>>>True, but let's expand our 'design thinking' a bit outside the box.
>
>>That's not outside the box. All of the possible design variations
involving
>>two mirrors have been known for decades.
>
>You're right - with regard to the professional and advanced amateur
>community.  I was a bit overboard in that last post.
>
>But, what ATM books available today describe aplanatic Gregorian designs?
>That's where my point lies...unless you dig a good bit, and are willing to
>do your own design work...the starting amateur probably won't find out
about
>this design.  That's too bad because with two concave surfaces it should be
>pretty easy to fabricate and test...especially compared to many other
>2-mirror scope designs.
>
>>...I've had a spreadsheet posted for quite a few years to help with
>>the design of just about any Cassegrain variant you can think of.
>
>Thanks!  I'll take a look at it and hit you with questions off-list.
>
>Tom Krajci
>Albuquerque, New Mexico
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