Description of Chromatic Aberration
In optics, chromatic aberration (CA) is a type of distortion in which the lens is not able to focus all colors to the same convergence point. It occurs because lenses have a different refractive index for different wavelengths of light (the dispersion of the lens).
Chromatic aberration manifests itself as "fringes" of color along boundaries that separate dark and bright parts of the image, because each color in the optical spectrum cannot be focused at a single common point.
An achromatic lens design corrects the effects of chromatic aberration. It brings two wavelengths (typically red and blue) into focus in the same plane.
Both P-100 and C-100 series use pair of achromatic doublets, which are composed of two individual lenses made from glasses with different amounts of dispersion.
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