ARRI Prime 8R - Manual (Page 15)

What is a radical aspherical lens surface?
Most lenses use only spherical lens elements, which have a
surface with a constant curvature. Aspherical lens elements
have complex curved surfaces. The sophisticated technology
for creating such lenses was originally developed for lenses
for computer chip manufacturing. By using aspherical lens
surfaces, the optical designer can create a lens that is smaller,
lighter and optically better than lenses using only spherical
surfaces.
Aspherical lens surfaces offer excellent correction of spherical
aberration (improving resolution performance) and powerful
correction of geometric distortion. The front element of the
Ultra Prime 8R is an aspherical lens element of extreme curva-
ture, known as a "radical aspherical lens". Its primary function
is to ensure the rectilinear image geometry of the Ultra Prime
8R, while reducing size and weight at the same time.
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