RE: ATM 18 inch telescope

["Amelia Thomas" <amelia_thomas@hotmail.com>]

Mel bartels wrote.
>
>A little software program to help calculate dimensions of folded
>newtonians (look for foldref.zip)
>
>http://www.efn.org/~mbartels/tm/software.html
Hello Mel
down loaded your program but I have a question or 2. I believe I understand 
"mirror diameter" and "focal ratio". I think I understand "diagonal size" 
(wouldn't the diagonal size be the same for a folded reflector as it is for 
a standard newtonian)but am stumped on "focuser + tertiary flat height. 
Isn't the tertiary mirror the flat mirror that will reflect the light cone 
back down the tube toward the primary to a traditional diagonal that then 
reflects the image out the side of the tube through the focuser? If this is 
correct I would assume the tertiary flat height would be measured from the 
top of the primary. Anyhow I must be doing something wrong. Anyhow if you 
have a moment could you briefly explain the data needed? Sorry for causing 
trouble. Amelia

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