ATM Diagonal sketches

["Asaf S.-T." <asafs@ibm.net>]

I've decided on the diagonal for my 6" f/8 telescope. It will be 1.52". 
This will make the telescope specialized for Variable stars checkings.

But when I try to find out on a page how far the diagonal should be far 
away from the primary, inside the lightcone, I get a problem. I need to 
draw on a paper a light cone (triangle), and find the correct place to 
draw a 45 degree 1.52" line, that will be the diagonal. I uses almost any 
tool and idea possible fo finding the distance from the diagonal to the 
end of the "stopped" focal length of the mirror...

If last time I was stuck in building my telescope because of focal 
lnegth, now I'm stuck because a stupid diagonal... Why can't be smooth 
even once...?

----------------------------------------
Asaf Shtull-Trauring, Amateur Astronomer

http://www.maxnm.com/asaf/