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ATM diagonal
I have a 6" f/8 mirror and I bought a 1.3" diagonal. In my sketch's, in
stead of finding the size of diagonal I need, I checked in what point the
diagonal stops the "light gathering" of the primary, and "brings" it to
the eyepiece. is it possible that the length from the diagonal to the
focusing point will be 10"? I thought it should be about 4"...
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Asaf Shtull-Trauring, Amateur Astronomer
http://www.maxnm.com/asaf/