In 1886 ZEISS produced the first apochromatic microscope lens, a color-corrected objective lens for three wavelengths based on the calculations of Ernst Abbe. The foundation for this achievement was in part the concerted attempts by Abbe and Schott to improve optical glass.
Apochromatic lenses correct the lens error for three colors (red, green and blue) of the color spectrum by bringing the three wavelengths into focus in the same plane. Apochromatic objectives therefore produce images which are sharper and brilliant. Especially when image quality is of importance doing evaluations and documentation apochromatic objectives are beneficial.