Definitions for "Aspherical Lens"
A lens that is not spherical in shape. The technology to create non-sperical lenses wsa invented to reduce image distortion that is a common characteristic of a spherical lens. Aspherical lenses are generally molded out of plastic or the plastic coated onto the surface of a glass lens. Comments & Discussion
Type of lens that is ground a particular way to better correct for spherical aberration. Results in better, more compact lenses.
Lenses, lensgroupes that differ from the standard spherical shape. Aspherical lenses reduce aberrations, but have high production costs. They are only appropriate to beams which are near to the axis.