Hi ,
I am trying to design a lens. When I open the spot diagram for the analysis. I am getting the following error.
Can any one help me figure out the error ?
Userlevel 4
+2
Hi Shubham,
This error happens when the chief ray can not make it to the image plane, so you need to figure out why the chief ray is being blocked in your system (TIR? Apertures?) and if there is a way to unblock the chief ray and let it propagate through to the image plane so you can view the Spot Diagram.
The best tool to check the chief ray path and understand why it's being blocked and at which surface, is the Single Ray Trace (Analyze > Rays & Spots). This tool lists the ray intercept coordinate surface by surface and will tell you if the ray is being vignetted at a surface. So you can define the chief ray (the ray that travels from a specific field point, through the center of the entrance pupil, and on to the image surface) and check what it's happening.
The Analyze Tab (sequential ui mode) > Image Quality Group > Rays and Spots > Single Ray Trace
Best,
Berta
Userlevel 7
+3
Berta is right, you should find out why the chief ray is not making it through. For wavefront analyses, this is fatal: the reference sphere is chief ray referenced, so no chief ray means no reference sphere.
For rays, spot diagrams and analysis with 'Geometric' in the title, it's not fatal. In the Spot Diagram, change 'Refer to' to Centroid
But if you can, fix the chief ray trace problem. No chief ray means no first-order (paraxial) properties for the lens.
Reply
Enter your username or e-mail address. We'll send you an e-mail with instructions to reset your password.
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）。