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Question

Difficulties while balancing CRA, Distortion and MTF

  • June 16, 2026
  • 4 replies
  • 31 views

Thaniga

Hi All,

I am currently designing a low‑cost imaging lens for a sports application. In my lens model I use the REAY operand to control image height, the RAID operand to control chief‑ray angle (CRA), DIMX to control f‑theta distortion, LACL for lateral‑color correction, RSCH for spot size and MTFT/MTFS for resolution across the field. During optimization I can obtain either good MTF or good lateral color with CRA and distortion depending on the operand weightings, but I cannot find a stable balance even when I adjust the weights gradually. In both cases, my geometric spot‑size results were poor. Please suggest optimization techniques to achieve a better trade‑off, or alternative approaches to indirectly control these parameters.

Note: candidate glass materials must have hardness greater than 450.

 

Thank you in advance for your support.

4 replies

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  • Fully Spectral
  • June 16, 2026

Hi Thaniga,

 

Can you please share your zemax file?

It will be easier to help that way.

 

Thanks,

Nadav


Thaniga
  • Author
  • Infrared
  • June 16, 2026

Hi Nadav,

Thank you for your immediate response. Apologies, I do not have permission to share the zemax file in the forum. Hope you understand. Please guide me to get the result by direct/ indirect optimization technique. Also, suggest me how to pick the low cost high hardness material in granta material picker.

 

Thank you for your support.


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  • Fully Spectral
  • June 16, 2026

Ok. understood. Can you share image of the system and the ray tracing? without knowlege of the system it will be hard to help


Thaniga
  • Author
  • Infrared
  • June 16, 2026