translate English to French: Therefore, purely data-based surfaces, like the Grid Sag surfaces or imported CAD objects may be useful for characterizing system performance, but are not so useful for the initial design stage, which is when we want to be able to change the surface smoothly under the control of the optimizer.
Le filtre anti-aberration annule efficacement la distorsion causée par le devant de la lentille. Il s'ensuit une vision pratiquement exempte de distorsion.