[ATM] Constraints on design

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

With some constraints:

    http://users.rcn.com/rflrs/rc2-06.txt
    http://users.rcn.com/rflrs/rc2-06.len
    http://users.rcn.com/rflrs/rc2-06.zmx
    http://users.rcn.com/rflrs/rc2-06.atm

For the same level of correction, if the f-ratio is changed, the space
between the corrector plate and the secondary changes; larger f-ratio
means the secondary moves closer to the corrector (not much larger --
at f/10.4, the spacing is close to zero).

What would impact your choice of the spacing? How would you implement
the design, particularly with respect to attaching it to the corrector?
How would this change your choice of corrector thickness?
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