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Aspherical Lens

Aspherical lens for effective aberration correction
This type of lens utilizes non-spherical surfaces on either one or both sides of the glass in order to eliminate certain types of lens aberration. These aspherical elements are particularly useful for correcting the distortion in wide-angle lenses. Such distortions are caused by variations in the magnification of the image, depending on its distance from the optical axis. Aspherical lens elements correct these distortions by continuously changing the refractive index from the center of the lens. Since the 1960s, Nikon engineers have established design theories and lens-processing techniques to refine the aspherical lens. In 1968, the OP Fisheye NIKKOR 10mm f/5.6 became the first interchangeable SLR lens incorporating aspherical lens elements. Since then, aspherical lenses have been an important part of the NIKKOR lens family, with every new addition to the lineup providing a new level of contrast, resolution and compact design.