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Question

problem using composite surfaces

  • September 1, 2024
  • 1 reply
  • 96 views

Elazar Elias

Hello,

 

I am trying to add irregularities to a Q-type asphere surface. The way I do it is by inserting a Zernike standard sag surface, and setting it as a composite surface, so that my Q-type asphere is the composite base.

As a first step, I did not change the Zernike surface, so that its sag is 0 across all the surface. I set its clear semi diameter to the same value of the Q-type surface (both are user defined).

I expect that because the Zernike sag is 0, the system will not be affected by defining the composite stack. However, when I set it as a composite surface, it changes the ray tracing and the system is affected. It seems that the power of the lens changes, although I did not change the sag (as far as I’m aware).

 

Has anybody faced such problem? How can it be solved?

Thank you.

 

 

1 reply

Jeff.Wilde
Luminary
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  • Luminary
  • 490 replies
  • September 5, 2024

@Elazar Elias:

It would be helpful if you could provide more detail about your model and exactly how it is being “affected” by the composite Zernike surface.

Just to check, I took the sample Even Asphere lens model, converted the first lens surface to a Q-Type (Type 1) and looked at the spot diagram and ray fan:

 

Then I added a Zernike Standard Sag with no power (0 sag) -- the ray tracing is *not* affected at all:

 

So, I don’t see the problem you describe…

Regards,

Jeff


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