[ATM] Focal Plane Calculation

[Bryan Stiles <bryan.stiles@gmail.com>]

Hello Everyone, I am finishing up my first mirror (8" f/6) and have a
question about the placement of the mirror. I have the focal length
(48.125") and will will probably be using either the Feather Touch or
JMI DX-1 focuser. Also I am using a Hastings Irrigation 10" aluminum
tube.
My question is this, How can I calculate the proper placement of the
mirror to make sure that I have enough room to focus? In other words,
ho can I calculate the position of the focal plane?

Thanks, Bryan
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