Radius and curvature are reciprocal to one another. Figure 7.1a shows a plano convex lens element with a spherical radius, imaging an axial point from infinity. The spherical aberration is quite ...

The Nokton 28mm f/1.5 is optically constructed of 10 elements in 8 groups, including aspherical lenses that help deliver sharp, high-quality images even when shooting wide open. These elements ...

Fast, ultra-wideangle to telephoto zoom lens Three ED (Extra-low Dispersion) glass elements minimize chromatic aberration, provide higher resolution and superior contrast One aspherical lens element ...

With use of aspherical lenses and low-dispersion glass with a high reflective index, Fujinon has achieved high optical performance through its unique precision work and assembly technologies.