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MKV
Carpal Tunnel
*****

Reged: 01/20/11

Re: Ross (et al) Null testing parabolas new [Re: Ajohn]
      #5835365 - 05/01/13 10:44 PM

Quote:

Seeing mention of ray tracing test set ups I wonder if some one could post an example oslo file. So far I haven't found a method of introducing a near point source with or without a lens in the light path.



In the Surface Data spreadsheet for OBJect THICKNESS enter the the near point distance. It's in the instructions, you know.

Mladen


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Ajohn
sage
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Reged: 12/03/07

Re: Ross (et al) Null testing parabolas new [Re: MKV]
      #5835754 - 05/02/13 08:00 AM

I didn't really ask the question very well MKV. Taking the problem as a whole I don't think oslo can cope with it other than being given precise source to lens and lens to mirror distances and or via sliders.

2 options on point sources - a perfect lens or a stop of pin hole diameter neither of which I believe involve changes to object distance. Not sure if the pin hole sized stop will work out or if it can be illuminated with a field angle close to 180 degrees.

John
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radicell2
member


Reged: 01/15/10

Re: Ross (et al) Null testing parabolas new [Re: Mike Lockwood]
      #5857141 - 05/13/13 10:14 AM

Quote:


The 200" Hale telescope was mostly tested with Foucault, then a little bit of caustic testing, and finally Hartman mask testing in the telescope itself. Yes, a 200" f/3.3 mirror was made mostly with Foucault testing.







The 200 inch mirror was figured using a three lens null corrector designed by Ross.


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