Skip to main content
Solved

Max number of fields : how to exceed the 2025 limit ?

  • November 25, 2022
  • 3 replies
  • 368 views
T
Forum|alt.badge.img+2

Dear all,

I’m working on a project of ultra-precise micro-arcsecond relative astrometry space observatory (Theia). 

Especially, I need to map the image plane (0.5°x0.5°) with a very high accuracy. For instance, I have to study the variations of positions of the PSF (with CENX/CENY) due to some perturbations (distortion, tilts of the mirrors...).

By default, the number of fields is limited to 2025 for my premium version, but I would need 100x100 fields.

It’s rather easy to generate such a new grid, but the parameter “i” (field number) of CENX/Y refers to the (default) field table.

Is there a way to use CENX/Y with this new grid ?

Many thanks,

Thierry.

Best answer by Mark.Nicholson

Hi Thierry,

 

I’d try a Universal Plot for this. You can vary field and step size to be whatever you want, I think.

    3 replies

    Mark.Nicholson
    Luminary
    Forum|alt.badge.img+3
    • Mark.Nicholson
    • Luminary
    • Answer
    • November 26, 2022

    Hi Thierry,

     

    I’d try a Universal Plot for this. You can vary field and step size to be whatever you want, I think.

      T
      Forum|alt.badge.img+2
      • Thierry.Lepine
      • Author
      • Monochrome
      • November 29, 2022

      Many Thanks Mark.

      I will try.

      Thierry.

      Mike.Jones
      En-Lightened
      Forum|alt.badge.img+3
      • Mike.Jones
      • En-Lightened
      • June 15, 2026

      CENX and CENY, as well as Zemax distortion calculations, are only geometric and do not account for diffraction.  In general neither will give the highly accurate centroids you need, which have to be diffraction based.  Use Huygens diffraction patterns to determine diffraction-based centroids.  Increase the Huygens sampling until the centroids stop changing in micro-arcseconds.

      Your optimization cycles are going to be SLOWWW.

        Community Posting GuidelinesAccessibility statement


        Zemax Community

        Need more help?

        To Chinese users:

        Do not provide any information or data that is restricted by applicable law, including by the People’s Republic of China’s Cybersecurity and Data Security Laws ( e.g., Important Data, National Core Data, etc.).


        不要提供任何受适用法律，包括中华人民共和国的网络安全和数据安全法限制的信息或数据（如重要数据、国家核心数据等）。



        Privacy policy   License Agreements    Terms of use    Cookie Policy   Zemax Account Licensing Policies