Hello Zemax team,
My question is regarding an error I met when I use a lens black box from lens vendor. As the screenshot below, I have tried to put the object to 1 meter away in front of the lens by adjusting the surface 1 thickness. However, an error as “cannit determine object coordinates” shows up once entered. How to fix this error or what’s the proper method to change the object distance at the black box? Thanks.
![](https://uploads-us-west-2.insided.com/zemax-en/attachment/b5959d2f-d856-44e8-a960-4b4b6b1a764a.png)
Best answer by Sandrine Auriol
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