Flint glass is a family of optical glass with comparatively strong visible dispersion and hence comparatively small Abbe number. A given lens power then changes more strongly with wavelength than it would in a less dispersive optical glass.
In an achromatic doublet, a negative flint glass element can compensate the chromatic aberration of a stronger positive crown glass element. This makes two chosen wavelengths share a focus; it does not remove every residual chromatic aberration throughout the optical spectrum.
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