From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


The Stellafane people are selling the Schupmann book.  I have a copy and it
does go through the whole process of how to design a Schupmann with all of
the necessary formulas.  Daly is a member of the Springfield Telescope
Makers as I understand and he had contol of making the 13" Schupmann
that is in the MacGregor Observatory.
I will note that you do need to have well annealed glass in order to make
the instrument perform properly.  The primary is refractive and the
tertiary is a Mangin mirror which means that it really needs to have good
refractive specs.  Using glass of the same melt also completely corrects
for any color error although I'd suspect that close melts on slower optics
will work just fine.  In addition, you don't need to use BK-7 as any glass
that you may have can be used - BK-7 is used because it is fairly cheap. 
The spec of the same melt of glass for all of the refractive pieces is a
definite requirement that is needed.
Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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