Re: [ATM] New page - Newtonian secondary sizing

["Donald Good" <donald.good@comcast.net>]

Mike,
Your diagonal table inspired me to do a little math on the Newtonian which
turned into a lot of math.  Anyway, I came up with this from first
principles of geometry (and a CRC Math Tables handbook):

http://www.atmlist.net/contrib/donald-dot-good-at-comcast-dot-net/NewtMath/N
ewtMath.htm

with a MS Excel spreadsheet:

http://www.atmlist.net/contrib/donald-dot-good-at-comcast-dot-net/NewtMath/N
ewtMath.xls
or
http://www.atmlist.net/contrib/donald-dot-good-at-comcast-dot-net/NewtMath/N
ewtMath.zip

If anyone has comments or finds mistakes, I would be happy to hear about
them.

BTW Mike, these equations calculate to within 1% of your table values.

Clear Skies
Don
 
-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Mike Lockwood
Sent: Tuesday, June 05, 2007 11:26 AM
To: ATMList
Subject: [ATM] New page - Newtonian secondary sizing

Hi,

After seeing a lot of questions about Newtonian secondary sizes over 
the years, I thought I'd just put up a large table of secondary sizes, 
computed for various mirror sizes, focal ratios, secondary-focal plane 
distances, and illuminated fields.  This way all the information is 
there in print, and TMs can easily compare sizes without plugging in 
numbers.

Here's the link:
   http://bi-staff.beckman.uiuc.edu/~melockwo/diagonals.html

Please let me know if you see errors.  The formulas used are ones I 
derived through geometry, and all the sizes I have checked agree with 
telescopes I have designed in the past.

	Mike Lockwood


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