RE: ATM the secondary mirror,

[Richard Ozer <rozer@ois-online.com>]

You would probably find it useful to download a copy of NEWT 2.0 for DOS or
2.5 for Windows.  You can model different sizes of secondaries (I'm assuming
that you are building Newtonians) and compare the degree of vignetting and
get good numbers for mounting distances.

 

-----Original Message-----
From: W.S. van der Schagt
To: atm@shore.net
Sent: 4/9/2000 8:36 AM
Subject: ATM the secondary mirror,

Ok guys, thanks for the replies, but now i have a 20" f/5 mirror, how do
i know what kind of secondary mirror i need ?
What's the formula for that and at what distance should it be placed ?
 
Thanks in advance,
 
Wouter