[ATM] RE: 25" mirror possibilities

["lou krajci" <loukrajci@comcast.net>]

>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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