Re: [ATM] Cassegrain Secondary Magnification

["Alfredo Rainho Neves" <arainho@snowsoft.biz>]

Hi Rod,

I actually used oslo to analyse this design, it has a lot of of-axis coma;
but since I want a planetary scope that should not be a big problem. The
design differs from the Klevzov, in that it  uses a  plain secondary mirror
after the meniscus, while the Klevzov uses mangin mirror.  I would like to
compare the two designes before building one. But since I cannot find any
data on the Klevzov, I guess I will try the "field-makutov". 

Thanks,

Alfredo



-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Rod Brackenridge
Sent: Tuesday, February 26, 2008 9:28 PM
To: atm@atmlist.net
Subject: Re: [ATM] Cassegrain Secondary Magnification


Hi Alfredo,

Not sure if this helps:

http://www.telescopes.ru/articles/article5.phtml

The same author also later describes several more developed
designs for 8 inch scopes with F2.5 primaries and F ratios
between 7 and 10.  The design specifications are in ATM Journal
issue 2.  Shafer also describes similar designs using
sub-aperture Maksutov correctors in the old Telescope Making
magazine.  

Good Luck,

Rod Brackenridge.
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