[ATM] Gimbaled Secondary mirror

[<atm@hudler.org>]

Further research on the Wetherell and Rimmer, turn up several derivatives,
one in particular; Cassegrain telescopes: limits of secondary movement
in secondary focusing by Roger N. Clark which concludes;

The maximum distance to which the secondary mirror can be moved with
respect to its primary in a true Cassegrain telescope with limited 
image deterioration is found to be proportional to the fourth power of
the focal ratio of the primary mirror. This limit is independent of all
other parameters describing the system when the magnification of the
secondary is greater than about 3.

This is perfect because our secondary is "greater than about 3", well 2.997
buts that's about 3 :)

Jack

Gimbals anyone?


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