[APML] [OT] T-Thread adapter measurements

[Emmanuele Sordini <vega@ulisse.it>]

Hello everybody,
I should have a friend of mine machine a custom adapter to fit into the 
back of a standard prime focus or eyepiece projection adapter, i.e. a 
simple T-thread adapter. Trouble is, I both have T-thread rings for cameras 
and telescope accessories to fit them onto, but I don't know the exact 
measurements for the T-thread connection (diameter, thread pitch, etc), nor 
do I have any tool to get those values exactly.
So, anybody out there know them, or could point me to some online link or 
publication where to get them from? Of course, a drawing or a sketch would 
be of great help.

Thanks in advance,
Emmanuele



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