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[ATM] Diagonal size

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Subject: [ATM] Diagonal size
From: "Adeildo Sombra" <adeildo@roen.inpe.br>
Date: Tue, 22 Jun 2004 12:23:02 +0100
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Hello All.

I 'm finish a 8in. f/6 mirror and trying to figure out the proper size of the diagonal.
I have a focuser 80 mm tall and intend to have a tube of 240mm diameter. I did the 
calculations and found that the m.a. of the diagonal should be 42mm, but this is higher than
20% of the primary mirror. I read that the obstruction rate should be beetwen 16 and 20%.
This telescope will be used only to direct observation, no cameras or whatever...

Does anyone have a suggestion?
Thanks in advance.
Adeildo.



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