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  #41  
Old 16-02-2021, 05:05 PM
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Atmos (Colin)
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That’s quite phenomenal Stefan, always in awe of your work!
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  #42  
Old 18-02-2021, 11:18 AM
Stefan Buda
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Thanks Joshua and Colin for the encouragement.

Quote:
Originally Posted by JA View Post
If I read the results correctly that would be something like Lambda/25 wave-front error even counting up to the extreme edges and less than Lambda/50 for something like 90% of the total area. That's a wonderful and amazing result.

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It would be, except the graph I posted only shows the spherical components of the Zernike polynomial series.

Last edited by Stefan Buda; 18-02-2021 at 11:30 AM.
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Old 18-02-2021, 11:28 AM
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For people addicted to Zernike polynomials, here is the final results as generated with DFTF software from 40 interferograms.

I also went back to the Ross Null test to check the smoothness of the surface and to measure the final focal length. The smoothness looked very good, with no visible zones or other anomalies. The focal length is 1mm shorter than intended, but within expectation.
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  #44  
Old 26-02-2021, 10:05 AM
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I have to ask - do you sell these mirrors, or is it just a labour of love?
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  #45  
Old 26-02-2021, 01:29 PM
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Quote:
Originally Posted by toc View Post
I have to ask - do you sell these mirrors, or is it just a labour of love?
Hi Tim,

The owner of the Zerodur blanc approached me to turn it into a planetary mirror.
It may be a labour of love, but I have to charge as I am self employed with no other income.

I'm still working towards developing my CDK250 as a commercial product and not too far to go now.
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  #46  
Old 01-03-2021, 08:38 PM
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Quote:
Originally Posted by Stefan Buda View Post
For people addicted to Zernike polynomials, here is the final results as generated with DFTF software from 40 interferograms.

I also went back to the Ross Null test to check the smoothness of the surface and to measure the final focal length. The smoothness looked very good, with no visible zones or other anomalies. The focal length is 1mm shorter than intended, but within expectation.
Stephan! .....seriously?

Sorry for asking, but I suspect you have professional optical skills here that you have modestly not mentioned.
Did you get bored on Mt Olympus?
How did you acquire them?

The results you have posted are absolutely awesome.

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  #47  
Old 15-03-2021, 05:24 PM
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Sorry Peter, I've only just seen your reply.

I don't know how professional optical skills are defined, so all I can say that I've been pushing glass since 1985 when I made my first Newtonian, ready to view Halley's comet.
However I did not practice the craft for commercial reasons until recently.
The other thing is that making an f/5 mirror is not too difficult if you can measure it with an interferometer and you already have committed most of the learning curve mistakes on other pieces of glass.

Thanks for the appreciation.

Last edited by Stefan Buda; 15-03-2021 at 06:00 PM.
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