Wissen

An achromatic doublet — often just called an achromat or achromatic lens — is made of two glass elements with different refractive index and dispersion, cemented together. That combination brings two design wavelengths to a common focal point, which sharply reduces chromatic aberration compared with a single lens element. It's the go-to...

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...

Plano-convex and biconvex lenses are the two most common positive (converging) lens shapes. Both bend parallel light rays to a focus; the difference is that a plano-convex lens has only one curved surface, while a biconvex lens has two. Key Specifications at a Glance Parameter Typical Value Substrate N-BK7, UV fused silica...