Chromatic Aberration

Chromatic aberration includes both axial and lateral chromatic aberration. Chromatic aberration is a phenomenon caused by different refractive indices depending on the wavelength of light.
Axial chromatic aberration is a phenomenon in which the position of the image formed on the optical axis shifts according to the wavelength of the light, with short-wavelength blue light usually concentrated before the focal point due to its large refractive index and long-wavelength red light concentrated behind the focal point.
An optical design that compensates for axial chromatic aberration is also possible and is used when switching between different wavelengths of illumination for inspection. (VS-H-IRC Series)

The magnification chromatic aberration is crisp and clear in the center of the image, while a color shift occurs at the edge, giving the appearance of color fringing on the increase.