from The Century Dictionary and Cyclopedia

  • n. A lens system, designed by Abbe, consisting of a combination of ten lenses with homogeneous immersion. It is achromatic for three colors, and therefore free from secondary spectra, and aplanatic for two colors.


Sorry, no etymologies found.


  • Advanced glass formulations by Zeiss, Schott, and Abbe helped produce the first apochromat objectives.


  • An apochromat is corrected for three specific wavelengths of light -- usually red, green, and blue -- and brings those three wavelengths to the same focus, providing slightly sharper images than an achromat.

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