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 # Example 11: Basic Sequential 

 Last update: 17.07.2025 

Ex 11: A new sequential file is created and saved. The system aperture value (entrance pupil diameter) and apodization type are changed. Thickness, radii, and material are changed and a rectangular aperture is placed on surface 1. The Scale Lens tool is used to change the system units to inches. A quick focus is performed and then a universal plot is created. The settings for the universal plot are changed to display the RMS spot size as a function of the thickness on the last surface.

```
Input:      None
<p>Output:     API\e11_basic_seq.zos
Zemax\Configs\UNI.CFG
</p>
```

[C#](page_ex11_cs.xhtml)

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