Two 1.18'' (30mm) biconvex lenses, a 4x and a 6x for a total of 10x magnification, provide a distortion-free image. They consist of coated lenses that are cemented together using different types of glass. The result is crystal-clear optics with no color aberration. The unique system eliminates extraneous colors. Eschenbach uses superior optics throughtout the viewing field. Traditional, technical folding magnifiers provide the high power optics and durability to meet any industry standard.