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Aspheric surface

The aspheric surface is a surface of revolution whose sag is given by the sum of the standard conicoid sag expression plus an even polynomial in the radius r=(x2+y2)1/2:

missing

By setting the curvature c to zero, this surface may be used as a general power series surface of even order.

At its vertex, surface has curvature c+2a2

The polynomial coefficients are entered in the parameters section of the surface data editor.

Parameters

a2, a4,..., a20
Aspheric coefficients for surface sag

See also