Achromatic lenses have various configurations, the most common of which are positive achromatic lenses, negative achromatic lenses, three-phase achromatic lenses and aspherical achromatic lenses. It is important to note that the achromatic lens can be a double lens or a triple lens (three components), and the number of elements has nothing to do with the amount of light after correction. In other words, a two-color or three-color achromatic lens can be used to correct red and blue light in the visible light range.
Aspherical achromatic lenses are economical lenses with excellent chromatic aberration and spherical aberration correction functions. It meets the strict imaging requirements of optical and vision systems in an affordable way. With the aid of aspherical achromatic lenses, relay systems, and condenser lens systems, high numerical aperture imaging systems can be improved. Generally speaking, the resolution of aspherical achromatic lenses is better than that of achromatic lenses due to its special achromatic lens design.
Achromatic lenses are used to minimize or eliminate chromatic aberration. The achromatic design also helps to minimize spherical aberration. The achromatic lenses originally designed for telescopes can now be found in various optical instruments including cameras. Achromatic lenses are ideal for a range of applications, including fluorescence microscopy, image relay, inspection applications or spectrometers. Compared with a comparable single lens, an achromatic lens designed by gluing two components together or installing two components in a unit can produce a smaller beam spot size.