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Diagonal mirror size

Started by rich265, 01/30/2008 03:27PM
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Posted 01/30/2008 03:27PM Opening Post
Rich Sabo
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Join Date: Jan 2008

Location: Cassville NY, US

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I am making a 10" Dob and have a 2.12" minor axis diagonal. I had planned for an f6 but am having trouble finding an f6 mirror I can afford. Will this diagonal work for an f5 primary mirror? Is there a simple calculation for finding the best secondary mirror size? Thanks from a newbie
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Posted 01/30/2008 03:32PM #1
Jon Isaacs
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Join Date: Jun 2001

Location: San Diego CA, US

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THere are several calulators available. The one I use is Newt for Windows...

It's free.

http://www.dalekeller.net/ATM/newtonians/newtsoft/newtsoft.htm

jon
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Posted 01/30/2008 07:37PM #2
Floyd Blue
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Location: Bakersfield CA, US

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I ran this through NEWT and it appears that the 2.12" mirror would be fine for a 10" f/5.
I would go ahead with it.
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