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Re: [ATM] A two way null test for convex hyperboloids

I forgot to mention Peter Smith has a nice writeup of tests for Cassegrain 
secondaries at <http://www.users.bigpond.com/PJIFL/page13.html>. He doesn't 
mention the Schmadel test, but he does discuss the reverse version where 
the hyperboloid is the first surface after the source and the reflection is 
off the spherical back. Here's Mauritz's target secondary:

*LENS DATA
No name
  SRF      RADIUS      THICKNESS   APERTURE RADIUS       GLASS  SPE  NOTE
  OBJ       --        1.4587e+03 V    0.001459             AIR

  AST   1.3746e+03     20.000000     80.000000 AS       QUARTZ C *
   2   -4.1468e+03 V  -20.000000 P   80.387718 S       REFLECT
   3    1.3746e+03 P -1.4587e+03 P   80.000024 S           AIR   *

   4        --            --          0.001790 S           AIR

  IMS       --            --          0.001790 S

*CONIC AND POLYNOMIAL ASPHERIC DATA
  SRF        CC          AD          AE          AF          AG
   1      -5.907000      --          --          --          --
   3      -5.907000      --          --          --          --

This gives a much better null than the previous example (RMS ~ 0.001 waves).



------
Michael Peck
mpeck1@ix.netcom.com

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