RE: ATM 18 inch telescope

["Mutalib Abdallah" <omegatroid@hotmail.com>]

You can save a lot of money with this kind of telescope.  You don't need an 
eyepiece: just look directly into the secondary.  That works because 
parallel rays are coming out.


>From: "Good, Donald" <dgood@aha.org>
>Reply-To: "Good, Donald" <dgood@aha.org>
>To: 'Steve Fejes' <jsfejes@swva.net>, usc@sover.net, ATM@shore.net
>Subject: RE: ATM 18 inch telescope
>Date: Wed, 2 Jan 2002 17:25:46 -0600
>
>
>Search the ATM archives at http://astro.umsystem.edu/atm/ for Mersenne 
>which
>is another type of folded Newtonian that uses a convex parabolic secondary
>to transfer the image down to the bottom with the help of a smaller
>secondary (refractor) scope to refocus the image. . . . with one of these 
>arrangements.
>
>Don
>
>




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