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I am using a Standard Surface to model a concave mirror in non-sequential mode. The curvature of the mirror is defined with the Radius parameter.

To correct for aberrations I want to use two different radii, one along X and one along Y. Which object should I use for this purpose?
Hay Jonas

I think the surface you may be looking for is a biconic surface.
 
Exactly what I was looking for, thanks!