Apochromat
![Chromatic aberration of a single lens causes different wavelengths of light to have differing focal lengths.](/Images/godic/202412/21/Lens6a1931.png")
![Apochromatic lens brings 3 wavelengths to a common focal plane. (Note that this lens is designed for astronomy, so one of the 3 wavelengths is outside the visible spectrum.)](/Images/godic/202412/21/Apochromatic_focal_curve.svg1931.png")
![Focus error for four types of lens, over the visible and near infrared spectrum.](/Images/godic/202412/21/Comparison_chromatic_focus_shift_plots.svg1931.png")
An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses.
Apochromat lens
英语百科
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