Wissen

A meniscus lens has one convex surface and one concave surface — the shape gives it its name, since it looks like a crescent moon in cross-section. Meniscus lenses are rarely used on their own; they're almost always paired with other lenses to correct aberration and refine an existing light path. Key...

A spherical singlet lens has one or two surfaces ground to a constant radius of curvature — the simplest and most widely used optical lens design. Because a sphere is easier to generate, polish, and test than any other surface, spherical singlets remain the default choice for focusing, collimating, and imaging applications...

An aspheric lens has a surface curvature that changes continuously from the center to the edge, instead of staying constant like a spherical lens. That extra design freedom lets a single aspheric element correct aberrations that would otherwise take several spherical lenses to fix. Key Specifications at a Glance Parameter Typical Value...