Why Use Achromatic Lens?

Achromatic lens is a kind of lens which is made up of two kinds of optical components: positive low refractive index and negative high refractive index. Compared with a single lens containing only a single glass, the dual-lens design can provide additional design freedom for users and further optimize the performance of the lens. Therefore, achromatic lens has more advantages than single lens with equal diameter and focal length.

Achromatic lens has various configurations, among which positive achromatic lens, negative achromatic lens, three-in-one achromatic lens and non-spherical achromatic lens are common. It is important to note that achromatic lenses can be bichromic (dual elements) or triad (three elements), and the number of elements is independent of the number of light corrected by the lens. In other words, double or triple achromatic lenses can correct both red and blue light in the visible range.

The achromatic lens is far superior to the simple multi-color "white light" imaging lens. The two components that make up an achromatic lens (literally "uncolored lens") are combined to correct the inherent chromatic aberration of glass. The achromatic lens is very cost-effective in multi-color illumination and imaging because it can eliminate the difficult chromatic aberration.

Since the axial performance of achromatic lens is not degraded by using larger aperture, it is unnecessary to "reduce" the volume of optical system. "Reducing" aperture refers to reducing the aperture of a lens, such as through a pinhole or aperture, to improve the overall performance of the lens. By making full use of the whole aperture, achromatic lens and achromatic lens system can achieve faster speed, higher performance and more powerful functions than the equivalent system using single lens.