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

Richard,
Perhaps I was a bit unclear on the set up. Yes the "lens" is a double convex.
For example, to test the R1 1374.6 mm surface the light source is
placed 697.6 mm
in front of the lens. Then the light pass through the R2 1277mm
surface, reflects on the R1 1374.6 mm surface, then refracts again
through the R2 surface and focuses back to where the source is
located. See figure
http://hem.bredband.net/mauritzandersson/convextesting.jpg

*LENS DATA
Wavelength 632.8 nm
 SRF      RADIUS      THICKNESS   APERTURE RADIUS       GLASS  SPE  
 OBJ       --            697.616252      1.000000             AIR     
  1    1.2770e+03     20.000000        80.781073 S        QUARTZ C    
    CC -4.91
  2   -1.3746e+03    -20.000000       81.954063 AS   REFL_HATCH       CC -5.907
  3    1.2770e+03   -697.616252     80.781022 S           AIR         
       CC -4.91

To test the R2 surface everything is reversed and the source/knifedge
position is 670.44 mm from the lens.

Hope that helps....
/Mauritz

On Apr 5, 2005 7:08 PM, Richard <cnc@cncservo.co.uk> wrote:
> Hi Mauritz,
> 
> OK, I can get a kind of null with the mirror as biconvex form,
> but there's over 10 waves of spherical abberation.
> 
> Null is at 657.1mm from first surface.
> 
> --
> 
> Best regards,
>  Richard
> 
>
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