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. ==Explanation== Chromatic aberration is the phenomenon of different colors focusing at different distances from a lens. In photography, chromatic aberration produces ...
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http://en.wikipedia.org/wiki/Apochromat
A lens consisting of three or more elements which gives a greater reduction of chromatic abberation than that of a two-element (Achromatic) lens.
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http://www.encyclo.co.uk/local/20448
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