Hi everyone, I have a question for you.
I want to design an off-axis three-mirror imaging system (in sequential mode) but I don't understand how to control the five distances pictured in the image below.
![](https://uploads-us-west-2.insided.com/zemax-en/attachment/82a83635-89a4-4f44-a7bc-f7d7212efec8.png)
I'm looking for a way to avoid light obscuration and prevent surface interference when optimizing.
Until now, I tried to control the distances using the global vertex coordinates MFE operands without success. Any suggestion would be really appreciated.
Thank you.
Best answer by MichaelH
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