Re: ATM SCHIEFSPIEGLER

["B. Pepin" <atmjedit@conceptsnet.com>]

Hi David,

Some specifics about TCTs are in several issues of Amateur Telescope Making
Journal. See Issue 12 (Robert Simcoe, Mirror Making and Testing hints Using
Up-to-Date Technology and Materials) and Issue 14 (John Francis, Improved
Test Methods for Elliptical and Spherical TCT Mirrors.

Three new types of Schiefspiegler, and means for fabricating and testing the
optics are scheduled for ATMJ 16, coming soon.

Barlow Pepin
Managing Editor ATMJ



----- Original Message -----
From: David M Groski <David.M.Groski@usa.dupont.com>
To: <ATM@shore.net>
Sent: Friday, September 15, 2000 8:51 AM
Subject: ATM SCHIEFSPIEGLER


>
>  After attending this years Stellafane and not displaying a 'scope,  the
> ATM bug has bit me again.  I decided to build a 4.25" Kutter Schiefspieger
> and have ground the optics to the proper RC . It took three returns to 400
> grit  after grinding with 600 and flash polishing so I could use a knife
> edge test to check the RC and get it to within an  1" of what the design
> calls for. Has anyone else made one of these 'scopes ? I would like to
find
> someone has gone before me  to exchange ideas.
>
> Best Regards,
> Dave Groski
>
>
>