G02B 27/0062

Optical systems or apparatus not provided for by any of the groups [CPC: G02B1/00] - [CPC: G02B26/00], [CPC: G02B30/00] {for optical correction, e.g. distorsion, aberration for correction of secondary colour or higher-order chromatic aberrations by controlling the dispersion of a lens material, e.g. adapting the relative partial dispersion}