Re:ATM Cassegrain as second telescope project.

[kwhitefire@juno.com]

I guess I could go for a Dall Kirkham design, but the thought of using the
one primary as an f/4 rich field instrument and an f/15 planetary telescope
is quite appealing.  Besides, I'm after a challenge.

Decrease the primary f/D to around 3.25 to 3.5.

If you're going to do a variation on the theme of a Cass, go with a Ritchie-Chreitien.  It has no coma, and if you make it with a long enough f/D it will have a separately useful primary mirror.  Difficulty is slightly greater than with a classical Cass, but the optical system is far superior to a DK.

Kevin of Western FL
Seeker of the Darkness




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