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 # ProjectionLens – Getting/setting aspheric parameters

 Last update: 22.04.2026 

This page presents you an example on how to get/set the aspheric parameters of a Projection Lens.

```ironpython
pl = SpeosDes.ProjectionLens.Find("TIR Lens.1")
pl.BackFaceAspherics[2] = 2.3
print pl.BackFaceAspherics[2]

```