From: "Richard Ozer" 
To: "Phyzzx" 
Cc: 
Reply-To: "Richard Ozer" 


The optimum secondary size will vary according to your focal length and
tube diameter.  You should download a copy of NEWT and use it to model your
scope.  That way you'll choose the proper secondary and drill all the holes
in the right place...

http://home.att.net/~dale.keller/atm/newtonians/newtsoft/newtsoft.htm

RO

----- Original Message -----
From: "Phyzzx" 
To: "atm" 
Sent: Thursday, August 21, 2003 4:01 PM Subject: ATM Secondary Mirror...


Hello all,

I am just about finished with my 10" dob, and now it's time to select
a secondary mirror.  What size should I purchase?  Is there a formula I
should follow to determine the size of the secondary?  Let me know all!
Thanks in advance for your assistance, Jon

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