[ATM] The Norman Test

["Bob May" <rmay@nethere.com>]

I've gotten the article on the Norman Test from Dominic (thanks
Dominic!) and am trying to get it into a condition for my
website.  From what I have read on the article, it is good onlly
for doing secondaries for ae of between -.5 and -=1.8 or so for
eccenctity.  This is tied to the refractive index of the glass.
Not good enough for a R0C design but adequate for a more
classical cassegrain.
Is there a possible solution for doing higher e values?
Basically, a point source of light is shined through the
secondary glass which is a planoconvex lens and reflecrted back
to the source where it is picked off by a beam splitter and a
null is obtained.  The mirror behind the lens is pjut at the
focal point of the lens.  The e value is obtained for the
difference in refractive indexes of air and the glass.
Bob May
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